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.
Why we don't use alkyd (oil base primer) when painting kitchen cabinets.
How to prime and caulk oak kitchen cabinet doors
When a surface is clean and sanded properly, primer bonds and penetrates deeper. When primer bonds and penetrates deeper, this improves the look, durability and feel of refinished cabinets. This is how we paint kitchen cabinets to look new again.
Check out how great 1 coat of Benjamin Moore Aura covers over this red paint. Two coats is just beautiful. No primer needed.