What is primer?

primer or undercoat is a preparatory coating put on materials before painting. Priming ensures better adhesion of paint to the surface, increases paint durability, and provides additional protection for the material being painted. Primer is the first "complete coat of paint" of a painting process applied to a surface. Such paints are designed to provide adequate adhesion to new surfaces or are formulated to meet the special requirements of the surfaces.

The best primer sealer for kitchen cabinet painting is BIN Shellac.

Kitchen cabinet Primer - BIN Shellac