Peeling from concrete floors
(Detachment of a dried paint film in pieces, usually caused by moisture or grease under the painted surface). Paint peeling from concrete floors.
Peeling from concrete floors
Detachment of a dried paint film in pieces.
Possible causes
- Alkali containing concrete.
- Presence of grease, oil, wax and dirt when floor is being painted.
- Moisture seeping through concrete floors.
- Crumbling old concrete.
- Coating applied to a bare un-etched, un-cured concrete floor.
Solution
- Remove the paint by scraping and if necessary use chemical strippers. Clean the floor with hot water and a detergent solution. Do not use mild dish washing detergents. Rinse and allow surface to dry for several days. Once the surface is clean, mop with a 10% solution of muriatic acid. (for water-thinned coatings use a 10% of phosphoric acid) Allow the solution to remain on the surface for 10-15 minutes. Rinse the surface with clean water. This treatment is called etching. Properly etched surfaces should resemble the texture of fine sand paper providing a better bond. Surface is ready to be painted.