Masonry Block Filler

Zinsser Block Filler 2X is a high-build acrylic primer for interior and exterior residential, commercial, and industrial applications.  It has twice the thickness of ordinary primers to fill pinholes and seal voids in concrete block and masonry, resulting in a smoother and more uniform topcoat.

• High-hiding formula
• Provides excellent topcoat protection against concrete salt (efflorescence) damage
• Features 2X better adhesion and thickness versus competitive primers
• May be used on concrete, cinderblock, brick, stucco, fiber cement siding and other cementitious surfaces