StoneTech Heavy Duty Exterior Sealer for Stone & Masonry, 1-Quart (.946L)

Product arrived opened , and leaking. It was missing about 1/4 of the liquid. Box was soaked

(READ NOTE about product's retirement at review's end.) -- My front porch is covered with natural slate tiles that require a sealer. After installation of the slate tiles about 12 years ago, I used StoneTech's stone & tile cleaner followed by their Heavy Duty Sealer. Both products worked like a dream. The cleaner did a great job of preparing the tiles for the sealer. The sealer applied easily (two coats) with a foam roller (followed by wiping off the excess with a cloth): it absorbed completely and deeply into the tiles. Afterwards, the color of the slate tiles was magnificent. The sealer is durable, lasting about 4 to 5 years without needing a 'maintenance' recoat. This Fall (2025), I bought more stone cleaner and the sealer for another maintenance coat. I am very happy with the result again. NOTICE: The Stonetech Heavy Duty Exterior Sealer is SOLVENT-based, which makes it very durable. Unfortunately, Stonetech discontinued its solvent-based sealer and replaced it with a WATER-based sealer. No water-based sealer holds up as well in exterior applications. Once the current stock of solvent-based sealer is sold out, the Heavy Duty Sealer is gone forever. I bought a gallon to store away for the next maintenance coat.

Works very well as a sealer for the sandstone surrounding our swimming pool. I apply it once a year, and have noticed a significant reduction in the amount of sand appearing in the pool. Easy to install.

Used this around my pool area. The water is beading up on the flagstone for now. I will see how it holds up over the winter months! Seems good so far!

Used this on slate topped fire pit Sealed well, sheen held up over the summer elements Will see it weathers the winter. Most likely would buy again