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Are you planning a DIY garage floor epoxy installation? If so, consider this a “must read” if you want to avoid the most common errors that people make when applying a garage floor coating. From peeling epoxy floors to bad finishes, these 5 mistakes will cover 95% of all problems associated with either epoxy floor failure or appearance issues.
Day after day people install their own garage floor coatings and with great success. After the anticipation of creating a nicely coated garage floor however, nobody wants to go through the headaches and heartaches created when your floor doesn’t turn out like you expected.
So take a few moments to look over our list of common epoxy installation mistakes in order to insure a successful floor coating for your garage.
1. Poor floor preparation
This is the most common reason by far for epoxy floor failures and/or bad finishes. Many times when doing an epoxy garage floor coating for the first time, people underestimate how important it is to prep the concrete properly. It involves much more than making sure it is clean. Epoxy will not adhere to a smooth surface.
Not only does the surface have to be free of all oils, waxes, and other contaminants, the pores at the surface of the concrete need to be opened up properly. This usually involves acid etching at a minimum. Grinding the concrete in preparation for epoxy is even better, but it isn’t always feasible for the average homeowner. You can learn more about which method is best for you here.
The most common problem associated with poor floor prep is peeling or delamination of the epoxy.
Fisheyes is another problem. This is created by contaminants in the floor, such as grease or oil that causes the epoxy to pull away from the concrete while curing. It forms a circle in the finish resembling a fisheye.
2. Moisture in the concrete
This common mistake usually happens from not allowing the concrete to dry sufficiently after acid etching. Depending on temperature and humidity, you need to allow for a minimum of 24 hours, sometimes longer, for the concrete to dry. If not, moisture that is still trapped in the pores of the slab will rise to the surface and create bubbles in the finish.
Some water based epoxies and primers allow for application to concrete that may still be damp however. Contact the manufacturer for further information if you are unsure.
Not performing a moisture test is another mistake. Moisture under the slab can create hydrostatic pressure that will actually cause the epoxy to separate from the surface, sometimes taking pieces of concrete with it. You can avoid this problem by doing a simple moisture test first to determine if your floor is suitable or not for an epoxy coating.
3. Stretching out the epoxy
Stretching the epoxy out in order to cover the entire floor when you are running low will result in areas with a much less glossy surface and a distinct difference in color appearance. It also creates a weaker coating. This is a common mistake that is made with the single coat epoxy paint kits such as those from Rust-Oleum and Quikrete, but can also happen with premium epoxy products as well.
If you have a 400sf² garage floor for example and purchase a kit that has a coverage rate of 300-400sf², you will not have enough epoxy. A properly prepared floor is porous and will absorb some of the coating. You will run short.
Many manufacturers state in the fine print that you can expect up to a 15% material loss due to product left in the container and first coat applications. Most DIY installers are not aware of this. You can avoid this problem by making sure not to underestimate the amount of epoxy that you need.
Also, when pouring the freshly mixed batch of epoxy onto the floor or paint tray, do not scrape or try to get every last drop from the mixing container in an attempt to get the best coverage rate. The very bottom and sides of the container are never fully mixed properly. Doing so may result in spotty areas of the coating that will remain soft and not harden.
4. Faulty mixing of the epoxy
There are many problems associated with improper mixing. The most common of these issues is mixing too fast with a paddle mixer and trapping air in the epoxy. If this happens, you will get air bubbles in the surface during application. You can easily avoid this by not pumping the paddle mixer up and down or running the mixer too fast near the surface creating a vortex and sucking in air.
Other issues are not mixing the Part A resin and Part B hardener correctly or getting the ratios incorrect. Pay close attention to the mixing instructions. Some epoxies require the newly mixed batch to sit for a specific time before application. This is called induction time. If you don’t allow for this then the epoxy may not cure and harden properly.
5. Not following temperature and/or humidity restrictions
Be sure to follow the manufacturer’s recommended instructions for temperature and humidity. Epoxy applied at low temperatures or below those recommended may not cure and harden correctly.
If applying epoxy in high temperatures the pot life (time available to apply the epoxy) can be reduced by half or more. This can make the epoxy unworkable before you get it all applied as well as create bubbles from outgassing due to the warm temperatures.
High humidity levels can create a microscopic layer of moisture at the surface of the concrete that you cannot see. This will cause adhesion issues resulting in delamination or peeling of the epoxy. High humidity can cause some epoxies to blush at the surface as well.
Final thoughts
Achieving a successful floor coating isn’t that difficult. Many of these epoxy application errors can easily be avoided by thoroughly reading the manufacturer’s instructions. If ever you are in doubt, contact the manufacturer for clarification. Most problems could have been avoided this way. Also keep in mind that a bad batch of epoxy is extremely rare. The majority of problems associated with epoxy coated garage floors are due to these 5 common mistakes.
If you take the time to research your project, prepare your surface correctly, and make yourself familiar with the manufacturer’s instructions, you should be able to avoid these common mistakes and enjoy a successful garage floor coating that you can be proud of.
Robert says
I applied RockSolid (Mocha) to a fresh concrete (6months old) and washed it with the etching first, using a power washer to clean off. I allowed it to dry for 48 hours then mixed the epoxy for 4 minutes by agitating bag well, and agitated before each pour.
Applied epoxy and when it dried, there was no tackiness and it dried hard, however there is black splotches along fine cracks and fish eyes and a few bubbles. pretty frustrated with the product. Ive used other epoxy coatings in the past and have never experienced anything like this.
Shea says
Hi Robert. RockSolid is actually a polycuramine coating. We did a product review of it here. The biggest issue with polycuramine is that it goes on fairly thin to begin with. It’s imperative that the coverage rates be followed. The black splotches along the finer cracks is where the gray from the concrete is showing through. The coating penetrated the crack and thinned as it cured. Fisheyes are not a problem with the coating. It means there was contamination on the concrete and the coating was repelled by it. Sanding smooth the fisheyes and then applying an additional coat will take care of the color uniformity issues.
Dillin says
I’m painting my my garage with the rust-oleum RockSolid garage floor coating would you suggest also putting down the porous concrete floor primer ? The concrete is about 6months old (new house)
Shea says
Hi Dillin. No, you do not want to use the primer unless there are issue with your concrete. Just etch the concrete with the solution applied in the kit and then apply the coating.
Cheryl Trinidad says
I need to re epoxy my floor, after 14 years. What do I need to do before this application?
Shea says
Hi Cheryl. We have an article right here about that.
Wendell Kong says
Hi i just purchased the rustoleum one car garage epoxy kit. I power washed, then used a degreaser, then oxyclean, then used the etch(twice) to prep the concrete. Would it be advised to use a concrete primer before applying the epoxy coatng?
Shea says
Hi Wendell. No, concrete primers are acrylic latex paint products and not compatible with epoxy. They also will not adhere as well as epoxy. Your best adhesion is epoxy to bare concrete that has been prepared correctly – which it sounds like you have done.
Wendell says
I know that your site reccomends that you Do Not use silicone based concrete repair material to fill in cracks. Unfortunately, I don’t have the luxury of letting the epoxy or polyurethane products to cure for 7 days. Is there a downside to using silicone(cures in 2 hours), then apply the epoxy coating the next day?
Shea says
Hi Wendell. There are two issues with silicone. The first is that it’s silicone – epoxy will not adhere to it. The second is that silicone crack fillers shrink over time. This will cause a hollow space under the coating that can result in the epoxy cracking if pressure is applied. Epoxy is extremely hard, but it is not flexible. Have you checked your local home improvement centers for an epxoxy or polyurea crack repair product?
Wendell says
Hi, unfortunately, I’ve already put the dap concrete silicone into all my cracks. Is there a way to remove the silicone so i can reapply the rustoleum concrete patch you reccomend?
Shea says
Yikes… Unfortunately, it requires either the painstaking task of digging it out a little bit at a time with a screwdriver or similar. The other option is to use a small angle grinder with a crack chasing wheel. This will dig it out pretty quick and provide solid edges for the crack repair to fill to. This article has a video on how a crack chasing wheel works.
Joanna K Purdue says
Hi, what did I do wrong my floor is peeling really bad, looks awful, been on for 4 yrs.
Shea says
Hello Joanne. Unfortunately, we need much more information than that to help you out. What product was used exactly? What type of floor prep did you do? Was a moisture test performed? What does the underside of the peeled coating look like? Is it dusty with concrete or clean?
Danielle says
Hi, I am considering using rustoleum Rock Solid on the concrete floor of my outbuilding. I and my husband are novices at home repair, and it appears our first step is to see if our concrete is suitable. We took up carpet and linoleum from this area, and there is still a layer of old glue visible on the concrete. Very little of it is raised, it is almost all flat, but must this be removed before application of Rock Solid?
Shea says
Hi Danielle. Any oils, glues, mastic, or other contaminants must be removed from the surface. In your case, the glue will act as a barrier and not allow the coating to penetrate the concrete like it is supposed to. It will not adhere well to the glue either. The best way to remove glue is via grinding the surface. There are also special Eco friendly mastic and glue solutions that you can use, but they take longer and require some elbow grease.
Stan Simmons says
After finishing the garage should you use a mop and glo wax before you drive on it after it is cured. Do we need to put anything on it to keep better.
Shea says
Hello Stan. Once the coating has cured completely, just use a solution of 1/4 cup ammonia to 1 gallon warm water to clean the floor. You don’t want to use anything that will leave a residue on the surface as it will get slippery when wet and attract dirt which will tone down gloss.
Scott Honke says
I had an epoxy floor installed in my basement in three different rooms. It has been just over a month and I’m seeing small oil spot coming to the surface. The prep was done properly, there were no oil stain on the floor. I’m wondering if the floor was previously painted with a oil based paint, would the oil absorbed into the concrete and that is why I’m seeing these spots?
Shea says
Hi Scott. Applying coatings to basements can be tricky due to the fact that moisture can be a problem. Has the basement ever been damp from moisture before? Was a vapor barrier installed before the slab was poured? Was proper moisture testing done first to ensure that a coating could be applied? What you are most likely seeing is the result of water being pushed up through the slab to the underside of the coating and forcing its way through a small spot. This water carries a variety of substances from the minerals in the concrete. When it gets concentrated in one small area it can be dark and look oily. I would contact the company that installed the epoxy to have inspect the area to better determine what it is.
Char says
We just applied Rust-Oleum RockSolid to our garage floor in the last 24 hours and noticed some areas have a thinner layer of epoxy than other areas. Is painting over the thinner layer areas an option and if yes, what is the appropriate way of doing that to eliminate issues in the future?
Shea says
Hello Char. This is a common issue with RockSolid if your concrete was fairly porous or the coverage rate was stretched. What you need to do is apply another full coat to the floor to remedy the issue. The additional coat will not get absorbed into the concrete. As long as you do not exceed the coverage rates you will get uniform color and gloss across the entire surface of the floor. RockSolid allows up to 7 days to recoat before any additional floor prep is required.
Ian says
I put epoxy paint on my larder floor 2yrs ago. I decided to freshen it up and was told by my local supplier that final systems cs 10 would do. After 3 days I put water on the floor but after a week it hasn’t dried there’s still droplets on the floor, can i put epoxy paint on top?
Shea says
Hello Ian. Can you provide a link to the exact product you used and what you are trying to accomplish with it?
Jean says
Help! We have an epoxy floor done professionally. I wish they would have told us to pick a darker color and with more flecks. They didn’t – so now the floor has yellowed, you can see so many scratches, and it is slippery. It has been 5 years. It yellowed almost immediately. Is there anything we can do to get more flecks in it, and get rid of the yellow? Is diamond grinding the only option here?
Shea says
Hi Jean. Darker colors are not good for a garage floor. They will highlight every bit of dust, foot prints, and tire prints in the garage. They never look clean accept the first day you clean it. You didn’t say what type of coating was installed, but our guess is that is was epoxy. Epoxy is not U.V. stable and will yellow with direct sunlight exposure or strong indirect U.V. light. Assuming that the coating is stable and not peeling, you can rough up the surface and apply a U.V. stable coating over it. We would recommend a single-part polyurea if you are doing it yourself. You can use an anti-slip additive for the final coat. You can rough up the surface with 120 grit sandpaper or use a floor maintainer with 100 grit sanding screens (easier and faster). We have an article here about recoating older floors.
Jean says
Thank you! Sorry – yes it is a 2 part epoxy. We will try this.
ram says
Hi ,
we applied rust-oleum epoxy coating to my garage floor. Before applying the coating we did all necessary floor preparation steps and finally end result looks fine. Do we need to really apply epoxy shield on this coating. if not what will happen.
Shea says
Hello Ram. Are you referring to a clear coat? EpoxyShield by Rust-Oleum makes both the color coat and clear coats.
Ram says
We initially applied Rust-Oleum EpoxyShield 2 gal. Gray Garage Floor Epoxy. Now we are thinking that still we need to apply Rust- Oleum epoxy Clear finish coating . Is it required?
Shea says
A clear coating for epoxy is never required, Ram, but it’s highly recommended. The clear coat will protect the color coat and color flakes. It also makes cleaning easier since the color flakes will not be collecting dirt at the edges. This article here explains more why a clear coat is recommended. If you elect to apply a clear coat, Rust-Oleum allows up to three days to recoat with another coat (clear or color). After that, you need to degloss and rough up the surface first.
Ram says
Clear coat comes with anti skid additive. Still we need to perform degloss and rough up the surface?
Shea says
If your current coat has been down for 3 days or less, then you can apply the clear coat directly. If it has been more than 3 days since application, then you need to degloss and rough up the surface of the current coating with 120 grit sandpaper first before applying the clear coat. It doesn’t have anything to do with the anti-slip additive. I hope that clears things up.
Ram says
Can we apply clear coat on 4th day without rough the surface on epoxy paint coat?
Shea says
You would need to contact Rust-Oleum customer service.
Rene Poole says
I just put a rustoleum kit on my floor and 4 days after it flaked in a few spots. I washed it and used the acid etch but I couldn’t rinse it real well because of the location. When it dried I used a good vacuum and went over the floor. I did two small rooms only one had this problem.did I do something g wrong.
Shea says
Hi Rene. Concrete prep is the most important step when apply a concrete coating. If not done correctly or well enough, the coating will delaminate. More than likely the concrete was not etched adequately and/or the reside left behind from not rinsing well enough interfered with the epoxy establishing a good bond to the concrete. To fix it, you will need to remove all of the epoxy and prep the concrete again.
Gail Tate says
Can I paint half my garage floor at a time? I have no place to put items in the garage except on one side, and then the other.
Shea says
Hello Gail. Are you painting or applying a coating? There is a big difference between the two. This this article explains more. If it’s paint, you can easily split the floor in half however you want. Paint blends well when overlapped. If it’s a coating, you need a natural border such as a contraction joint to split floor halves or sections. The reason is that coatings do not overlap and blend well like paint. The overlap layer is extremely obvious and does not look good.
Sami says
I followed all the instructions on the restoleum moisture stop product to apply on my garage floor. Now after rinsing with water I have several white areas on my garage floor. Is this normal? Will it interfere with the restoleum epoxy coating?
Shea says
Hi Sami. What you have is efflorescence. Yes, this will interfere with applying the coating. The white powder happens when the concrete is not kept wet as required and thoroughly rinsed well. Rust-Oleum mentions in their instruction that this can happen when not flushed (rinsed) properly. They state to use their efflorescence remover to get rid of the white areas. Before you do that though, we recommend scrubbing the area real well with a solution of 1 gallon hot water to 1/2 cup of TSP. Use a stiff bristled deck brush. Be sure to rinse well and do not let any concrete begin to dry before you are completely done. Many times this will take care of the problem.
Sami says
Thanks Shea, your suggestions worked very well. After cleaning with TSP I applied the Rocksolid efflorescence remover three times to completely get rid of white patches.
I have one more question. Is there a solution to protect the epoxy from UV light on the external portion of the garage floor?
Shea says
We’re glad to hear it cleaned up well for you, Sami. You don’t want to run the RockSolid past the garage door and out onto the concrete apron outdoors. It will amber (yellow tint) within a few months and then eventually chalk and deteriorate. RockSolid and other epoxy is not approved for outdoor use. This article here states why. What we suggest you do is color match the RockSolid with acrylic latex concrete paint and just paint that strip of concrete. Acrylic is U.V. stable and will not amber. Since you will only drive over a small section, this solution tends to work well for most people. If it does begin to peel or wear out, it just requires a recoat to fix.
Layne Anderson says
I was able to buy both Rocksolid and Epoxyshield for very cheap at an auction. Am I able to use both products as layers on top of one another? If so, which should I put down first? If not, which do you recommend? One of the reasons why I would do this is that I’m worried about uniformity as there are a lot of repairs to my garage floor. I did take off the top layer for sure with a Magna-Trap Turbo-Lite Grinder – is it common to not take off enough with a grinder? Should I worry about uniformity on larger repairs with rustoleum concrete patch and repair? I did grind the repairs down with the grinding also. Thanks.
Shea says
Hello Layne. Can you be more specific about the products? What are the exact names on the box? Is this RockSolid garage floor coating, metallic coating, clear coating? Same with EpoxyShield. Is it the Professional or the water-based? Have you checked the expiration dates? These products are not going to help smooth over imperfections in the concrete if that is what you are asking. They are residential quality, thin mil coatings. Proper surface repairs and grinding is what makes the difference. If you don’t have uniformity with your repairs, then it will telegraph through the coating.
Layne Anderson says
Oh yeh, they are uniform as I did grinding after I repaired. Everything is flat. Rust-Oleum EpoxyShield
240 oz. Gray High-Gloss 2.5 Car Garage Floor Kit……..and…..
Rust-Oleum RockSolid
152 oz. Gray Polycuramine 2.5 Car Garage Floor Kit. Both within expiration date. I’m more worried about the absorption difference between the concrete and the Rust-Oleum 24 oz. Concrete Patch and Repair Kit.
Shea says
OK, those two kits should work with each other to achieve a chemical bond when working within the recoat window. However, we recommend that you give Rust-Oleum Customer Service a call to verify. The Rust-Oleum Concrete Patch is 100% solids epoxy. It will not absorb any of the coating like the concrete will. The grinding is what provides the proper profile to achieve a mechanical bit. Your first coat will act like the primer coat (ugly coat). We recommend applying the EpoxyShield first since the coverage rates on bare concrete are better with a slightly better dry film thickness. The RockSolid has a glossier look of the two and the coverage rate will be better since none of the coating is getting absorbed.
Wayne Foulkes says
I coated half my garage floor with RockSolid 2.5 kit. The floor was etched with citric acid provided. Floor dryed for over 24 hrs. The finish is uneven as if it absorbed more in some areas. Can I coat over it with new RockSolid and how soon would I need to apply a clearcoat?
Shea says
Hi Wayne. This is a common complaint about RockSolid. It did exactly as you describe. Because it’s a relatively thin coating to begin with, if more gets absorbed by the concrete or the coverage rate is close to being stretched, then what you experienced will happen. You can apply a new color coat to get a consistent color and nice gloss appearance. You need to wait approximately 6-10 hours between coats depending on temperature. If you can press your thumb to the surface without leaving a print, then you can recoat. RockSolid allows up to 7 days for recoats without further surface prep being required.
Chris says
I have a question. I want to use 2 part rustoleum epoxy paint for my garage floor. It would be very convenient for me to paint half the garage with the other half of the garage storing all my stuff and when it dries, move everything, lightly sand a few inches of paint, and paint the second half. I just wonder if this is not recommended? Will the line border look strange or have issues down the road? many thanks for your advice!
Shea says
Hi Chris. If you have a contraction joint in the floor, then you can use that to act as natural border to coat one part of the floor at a time without issues. If you are dealing with a seamless floor, then that can be a problem. The reason is that coatings do not blend together well like paint on a wall does when they overlap. There will be obvious overlap marks where one side meets the other. Taping it off will produce a cleaner line, but it will still be noticeable where one coating ended and the other began.
Zeffie says
I read and read and watched YouTube. I talked to a painter and Home Depot people. I degreased and acetone washed then used Behr 1-part epoxy on the floor it’s in the process of drying now. I just read about a polyurethane topcoat. And now I read it’s not meant for 1-part and it will probably not last. Can I topcoat or seal this with something to make it last longer
Shea says
Hello Zeffie. We did get your email about the primer. The Behr 1-part epoxy paint is just a latex acrylic concrete paint with a little bit of epoxy resin added for durability. It’s not a true coating. Despite applying the bonding primer, you will get hot tire lift at some point. These type of paints are not chemically compatible with true coatings and not designed for clear coats. In addition, most clear coats that are durable are solvent-based and will soften paint when applied. It can really make a mess of things. Unfortunately, home improvement centers are not a good place to get information about garage floor coatings.
Jason says
Hi I just applied the rustelum rocksolid on my garage floor would you recommend a clear expoxy for better protection I know the box says I don’t need it
Shea says
Hi Jason. A proper clear coat is not required, but it is recommended. The reason is that the clear acts as a sacrificial layer and protects the color coat. Any scratches or other blemishes that occur during the life of the coating on the surface will happen on the clear coat and is less obvious than scratches in the color coat. We recommend staying within the same line of coating. You should use the RockSolid clear coat. RockSolid allows up to 7 days to recoat without further prep.
Chris says
Hi ,
I used rustoleum 2.5 car garage kit for epoxy flooring . But I made a mistake in not mixing the Epoxy base from both can s and dividing them back equally again . Now I have one half of the garage with a lighter shade of gray than the other. I am thinking of painting a sort of accent border over the uneven border To hide the transition between the two shades . Any ideas / suggestions are greatly appreciated
Shea says
Hi Chris. Unfortunately, there is not an easy solution for this other than applying another coat using the steps you mentioned to mix the color base first. You could tape off a section that is wide enough to create a color contrasting border stripe. However, unless you use an equivalent type of product (coating, not paint), it will wear and scratch much more easily.
Sharon in Oregon says
We applied Rustoleum Epoxyshield to garage floor too thin and it looks blotchy and awful. Would it help even out and improve the appearance to apply a clear coat in 2 or 3 days?
Shea says
Hi Sharon. No, that will not help at all. What you need to do is apply another color coat to get the proper thickness. This will richen and even out the color. Rust-Oleum EpoxyShield allows up to three days to recoat without further prep.
Frank Alfano says
i bought an epoxy at HD a week or two ago but the temperature is not cooperating and i havent applied it yet… its getting cold and i dont know if i can apply it before the spring, will the epoxy expire or not work properly? the container has not been opened… also, can i store it in the garage or should i move the tub into the house?
Shea says
Hi Frank. Coatings typically have a 1 year expiration date from date of purchase. Keep them in the house so that it does not get too cold or freeze. When you do use it, make sure to mix the part-A and part-B separately first since things can settle after sitting for long periods.
Robin Blanks says
Hey Shea’ Did a ton of research on Rocksolid and of course 50/50 reviews so I made sure I followed instructions to a “T”. Hit you up on some advice and here’s where I’m at. 440sq garage. Had great shape concrete grinded by pros. Rolled out 1 kit knowing it wasn’t going to cover efficiently. (can we load pics on here) it’s blotchy and dull. Ready to roll out kit 2 and possibly 3 at the same time to get it on thick? As per your advice, it appears the concrete was very porous and sucked up the first kit. What’s the hardest part of this process is knowing the thickness of the spread of product. Is too thick a problem?
Shea says
Hi Robin. The first coat is acting as the primer coat. Your experience is exactly why Rust-Oleum states not to grind the concrete if you can avoid it. Because RockSolid is a thin coating that penetrates well, the concrete absorbs much of the first coat. The good news is that the second coat will not be absorbed by the concrete and you will get coverage and thickness that is much truer to what they state. Based on that and assuming you are using the 2.5 car kits, this means you can theoretically get a max coverage rate of 450 – 500 square feet with an approximate thickness of close to 3 mils. That would be enough to provide the high gloss and true color that you expect.
You can apply RockSolid thicker, but no more than 6 mils thick at a time. This would require that you to use 2 kits for 1 coat. You can’t mix the two kits together because the exothermic properties of that much volume will shorten the pot life. This means you need to apply 1 kit for 1/2 of the surface and the the other kit for the other half. This means you might encounter a color match issue. To avoid that it would require that you cut the colored resin burst pouches and mix them together separately into a measured bucket. You would then pour exactly half of that measured bucket into another for two equal parts. You can then pour the smaller hardener pouch into one of the colored resin buckets, mix, and apply. Then do the same for the second application. This will assure color uniformity and this article here explains more. Or, you can just apply one kit across the floor as described earlier and then another on top of that if you want a thicker coating.
Steven A Friedrich says
I painted my garage floor and its been 3 weeks until I have time to put on the clear shield. I put flecks in the painting step. Is there anything I need to do before applying the clear shield
Shea says
Hi Steven. Can you please tell us exactly what products you are using? The word “painting” is subjective and means different things to different people. Thanks.