The Sealing Process of Paint
These paints are very poorly resistant to alkali. On the wet surface of concrete, the alkalinity is very high. This causes poor adhesion as the alkali makes resin system sticky and soft (saponification) through it hardness. Such reaction mostly happens on the concrete floor due to all the moisture in it. In such cases, it is best to remove it before recoating.
Alkyd Sanding Sealers
To create easy to stand coating, Alkyd Sanding Sealers is best preferred. Sanding becomes necessary for wood because the solvents raise the grains of wood. For wood stain or on new wood it is highly recommend to use Sanding sealers. This should only be used with alkyd varnishes because when polyurethane interact with sanding material, they can cause cracking of the polyurethane from the sealer.