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Oil painters must apply a wood arts protection to prevent the corrosive oil in the paint from permeating the wood support and harming the wood fibers. While acrylic painters are not impacted by this problem, sealing is still essential when using acrylic paint on wood to avoid Support Induced Discoloration (SID). Only acrylic paints are known to induce SID. Natural impurities in the support may create an amber yellow discoloration of any light colored or clear acrylic coating placed to the wood if it is not adequately sealed.
It’s not uncommon for primers and sealers to be mixed up. The underlying layer or substance is protected with a sealer. It should be shiny to provide a barrier that properly protects the surface (or non-absorbent).A primer is a base coat that aids in the adhesion of paint to the support. A primer is a coat that prepares the surface for painting in general. It’s important to remember that gesso is a primer and not a sealer. Because gesso absorbs moisture and has a satin or matte texture when applied, it will not effectively seal the wood unless numerous coats are done, and even then, it may not seal.
