Stainable Primer SPGAL Original Stain Primer For ALL Hard Surfaces Gallon Stainable Primer is the only product available today that does not require you to remove first No sanding or stripping of existing finish is required. Works with any type of stain or paint. Interior and Exterior primer containing real wood. The direction you apply in creates the woodgrain Water-based with low VOC and provides excellent stain blocking Transform anything into a stainable wood finish, Stain over metal, composite, presswood or real wood