Experience premium protection from alkali damage and efflorescence with Trade Decorators Alkali Resistant Plaster Primer. This high-quality primer boasts exceptional coverage and penetration, making it ideal for use on dry, untreated cement plaster, fiber cement, cement bricks, and even gypsum plaster. Count on our primer for a solid, robust surface free from any chalky residue. (Just 2 exclamation points, we swear!)