PVA primer is a type of primer used in painting projects, particularly for drywall. PVA stands for polyvinyl acetate, which is a synthetic resin that creates films and is often used in water-based or latex paints. PVA primer is a latex-based "paint" that seals the pores of the drywall, ensuring that the drywall doesnt show through and that the paint has an adhesive to stick to when applied. It is applied before painting to create an even surface. PVA primer is the proper name for drywall primer, and it goes onto a porous surface like drywall and seals the pores to create an even surface. Applying PVA primer is similar to applying paint, and it is recommended for use on new drywall. While PVA primer isnt necessary, it makes the job much easier than painting without it.