STONETECH® Heavy Duty Exterior Sealer is a solvent-based, natural look sealer that offers heavy-duty protection, water repellency and weather resistance to natural stone and masonry surfaces.

Uses (Exterior):

  • Countertops
  • Backsplashes
  • Floors
  • Walls


  • Heavy-duty protection against water-based stains
  • Minimizes efflorescence
  • Solvent-based formula
  • Exterior use

Recommended Surfaces include natural stone and masonry surfaces, such as:

  • Granite
  • Slate 
  • Travertine
  • Sandstone
  • Tumbled stone
  • Concrete


  1. Mask off any surfaces not intended to be treated
  2. Liberally apply an even coat of STONETECH Heavy Duty Exterior Sealer with a paint pad, paintbrush, paint roller or solvent-resistant, low-pressure sprayer. Do not use power sprayer. Do not thin before using. 
  3. Allow sealer to penetrate the surface for 5-15 minutes; denser material may require more time for sealer to penetrate. During this time, distribute excess sealer over entire area to ensure even penetration. DO NOT ALLOW EXCESS SEALER TO DRY ON THE SURFACE.
  4. Thoroughly wipe dry the entire surface with a clean, dry cloth to completely remove all excess sealer from the surface.
  5. A second coat may be needed for porous, absorbent surfaces and should be applied one hour after initial application as directed in steps 2-4.
  6. If sealer was not completely wiped off and a residue appears, wipe entire surface with a towel dampened with sealer. Use a white nylon pad to loosen residue and follow with a clean, white absorbent towel to remove.
  7. Full cure is achieved in 24-72 hours. Surface use may resume in 4-6 hours.
  8. Clean up promptly after job is complete, since rags and equipment that are wet with product may be combustible. Clean equipment with mineral spirits and allow equipment and rags to dry in a well-ventilated area out of reach of children and pets. After rags are dry, dispose of in accordance with local waste disposal regulations.
Prices, inventory and promotions may vary by retailer. Please call the store first to check actual availability of this item.