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Mad Dog Dura-Seal: Concrete & Masonry Primer

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Dura-Seal 24 is the best exterior masonry primer. Allows you to prime a hot masonry surface after 24 hours. That’s 6 to 28 days sooner than competitive products. Dura-Seal 24 helps projects last up to 20 years.

Dura-Seal 24: Concrete & Masonry Primer adheres to all masonry and concrete surface after the substrate has cured for 24 hours. It will adhere to high pH level 13, and moisture content of 20%, allowing you to prime and top-coat much sooner than any other primer on the market.

Mad Dog Dura-Seal 24 is for new, peeling or weathered masonry surfaces. Extreme sun, rain, heat, cold, humidity & salt air formula.


  • Adheres to high pH masonry and requires only a 24 hour concrete cure time
  • Ideal for sealing and conditioning above grade masonry substrates with weathered chalky surfaces, as well as green masonry with high pH balances
  • Save time and money by priming sooner than other masonry primers
  • Penetrates, seals and encapsulates masonry surfaces
  • Prevents peeling caused by efflorescence and salt damage
  • Mold and mildew resistant
  • Use on: concrete, block, stucco, brick, plaster, fiber cement siding, and weathered, chalky substrates where paint has difficulty adhering.


  • Available in gallons, and fives
  • 40% solids by volume
  • 200% elongation
  • 320 sq ft per gallon @ 2 mils dry (5 mils WFT)
  • Interior/Exterior above grade use
  • Apply by brush, roll, or spray
  • Back brush for best results
  • Re-coat time: 1-2 hours
  • Dries white and tacky to the touch
  • 300 + PSI adhesion
  • 100% Acrylic latex formula
  • Soap and water clean-up
  • <48 g/L VOC


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