KILZ®Masonry Waterpoofing Paint

KILZ® Masonry Waterpoofing Paint is for interior / exterior use and is available in white or gray. It creates a waterproof barrier and stops up to 10 PSI of water pressure on structurally sound masonry. It provides a mildew resistant finish with low odor and easy water cleanup. Ideal for all interior and exterior porous concrete and masonry surfaces including basement and retaining walls, masonry walls, cinder and concrete blocks, stucco, brick, foundations and landscape walls. Can be used on slightly damp surfaces. Do not use over oil or latex based paint.

CAUTION: Not for use on floors. Sealed surfaces may become slippery. Use caution when walking over a coated surface.


Please check availability before visiting your local retailer

Available in Gallons

Surface Preparation

  • New concrete must be completely cured (30 days).

  • Remove efflorescence, dirt, oil and grease. Clean with a concrete cleaner and degreaser.

  • Remove any mildew stains with a bleach and water solution or similar commercially available mildew remover, then rinse.

  • Etch the masonry surface with a concrete etcher when efflorescence is present.

  • Patch all cracks and holes with a fast-setting hydraulic cement.


  • Stir paint prior to use.

  • Use only when temperatures are between 50°F (10°C) and 90°F (32°C).

  • Apply with a high-quality nylon/polyester or other stiff synthetic filament brush or ¾” nap roller.

  • Two coats are required.

  • Coverage varies by surface. Coverage will be approximately 75 square feet per gallon on rough surfaces; up to 125 square feet per gallon on smooth surfaces.

  • IMPORTANT: If leaking is still present after two coats, it indicates that voids or pinholes are still open. Reapply product to these areas.

Dry Time at 77°F (25°C), 50% RH:

  • Dries to touch in one hour. Longer dry times are required in cooler temperatures or high humidity areas.

  • Recoat in four hours.

  • Full cure should be reached in 7-14 days.

Clean-Up & Disposal

  • Clean equipment and paint spatters with warm, soapy water.

  • If spilled, contain spilled material and remove with an inert absorbent. Dispose of contaminated absorbent, container and unused product in accordance with all current federal, state and local regulations.

  • To recycle or properly dispose of paint or primer in your community, call 1-800-CLEANUP.