Hi Gianna. An N95 like the 3M Aura is the minimum approved protection from concrete silica dust. It is limited by time and exposure. If you change it out frequently when grinding you will be OK. The type of respirator that Mark referred to in his comments is the half-faced respirators with dual replaceable cartridges.

Hi Jesse. There is no hard rule about this. Typically, all repairs are done first then the floor is profiled. However, you can do it the other way around if it’s more convenient. The etching won’t affect the crack repair product.

Hi Cassandra. Depending on how it’s used, a floor like this will last 10-15 years before requiring additional maintenance. What’s nice about systems like this, is that the additional maintenance to prolong the life is usually just the application of another clear coat. Once the clear coat starts to wear to the flakes and color coat, all that is required is to rough up the floor via sanding and then apply a new clear coat to make look almost brand new.