Thin, brittle residue on the surface of new concrete and the thin layer formed after curing, which causes paint film to peel due to poor adhesion.
Causes include
- The level of the laitance layer increases due to:
- Too much water in the concrete mix (causing excessive laitance separation)
- Excessive use of a trowel, resulting in a soft, weak surface film
- Newly poured concrete being exposed to rain and poor curing conditions
Solutions
- Determine the thickness of the laitance layer by leveling at the metal edge during the pouring of the new concrete surface
- Choose an appropriate removal method such as acid etching, sandblasting, or shot blasting, grinding, polishing, or mechanical stripping
- Apply a primer for adhesion with Beger Concrete Sealer. 1-2 coats, allowing to dry completely for 6-8 hours
- Topcoat with Durathane / DuraGuard paint or acrylic paint such as BegerCool UV Shield / BegerCool Diamond Shield Plus
