Zinsser Block Filler Primer (Case of 2) is a high-build acrylic primer designed for interior and exterior residential, commercial and industrial use. With twice the thickness of other primers, it fills pinholes and seal voids in surfaces providing a smoother and more uniform topcoat. Block Filler 2X high hiding formula seals semi-porous surfaces to provide better topcoat coverage and consistent sheen without pin holing.
Use on interior and exterior surfaces like concrete, cinderblock, brick, stucco, fiber cement siding, plaster, mortar, concrete masonry units and more to fill and smooth surfaces prior to applying topcoats units
Covers up to 100 sq ft depending on application method and surface porosity
Flat white finish is a high-hiding formula
Provides excellent alkali resistance and eliminates concrete salt damage on top coats
High build formula fills and seals voids in concrete surfaces and features 2X better adhesion and thickness
Allows for quick project completion: dries to touch in 30 minutes, recoat in 1 hour and apply to new masonry surfaces prior to 30-day cure of concrete
May be used with most latex or oil based top coats
Apply using a variety of application methods synthetic bristle brush, roller or airless sprayer
Strong enough for exterior application, low-VOC formula minimizes odors making it great for indoor use