CRL 321 acrylic latex with silicone is a new-age blend of acrylic latex and silicone that offers excellent primerless adhesion to brick, wood, metals, glass, plastics and ceramics. This acrylic latex sealant resists mold and mildew, is paintable with either oil or latex-based paint products and is an excellent water sealant. Its caulking versatility provides an easy tooling flow with simple water cleanup after the day is done. The silicone formula will give you the elasticity and the extended life expectancy that you require an expect from a CRL product. This latex silicone sealer offers excellent primerless adhesion to aluminum, wood, concrete, glass, ceramic tiles, etc. It can be painted 2 hours after application with quality grade latex or oil based paints.