With any floor coating preparation is an essential key to extend the protection and lifespan of the coating. To prepare a bare (rough) concrete floor prior to painting we always recommend a light abrasion first; this can be done either by a scarifying machine or track blasting (most effective method). This allows the paint to create a good lock and key effect with the concrete which then leads to much better adhesion.
If the floor has been power floated or is generally very shiny, the floor paint will not adhere to this surface. It is recommended to track blast the concrete to remove most of the top layer prior to painting. The structure of the top layer in a power floated concrete floor is generally unstable and easy to damage this is due to one small partial size been pushed to the top. If track blasting in not an economical scenario, you can use a scarifying machine or a concentrated Acid Descaler to etch the floor.
If floors are heavily penetrated with any sort of contamination it is important to remove it all before coating, the most effective way is to have the floor steam cleaned. Remember this will add moisture into the floor, so time will have to be allowed for the moisture to escape. If the floor has light or no contamination just a quick mop around with our Degreasing Solvent or Acid Descaler will suffice. Again ‘preparation’ is key for a good floor coating, should any moisture or contamination be trapped in the substrate the paint will simply blister and blow off.