Insl-X Aqua Lock Plus is a 100 percentage acrylic primer that provides excellent adhesion to a variety of interior and exterior surfaces. It has superior sealing and coverage qualities, product versatility and is an excellent base coat for both latex and oil-based finish coatings. It offers excellent stain blocking properties for water stains, wood tannin, fingerprints, smoke, crayons and more. This product contains an agent that inhibits the growth of mildew on the surface of the paint film. It can be used under wallcoverings and good adhesion to glossy surfaces.