STONETECH Heavy Duty Exterior Sealer, 1 Quart/32 Oz (946ML) Bottle

(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.

Dries clear, not glossy. Water beads up on it.

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

This will ruin limestone just as likely as protect it. I applied this to brand new limestone steps - my neighbor had the exact same steps built at the same place and time. Three years later mine are covered in black mold that not even bleach will remove. My neighbor's steps look flawless. Terrible false marketing here.

Used this on the lueder stone on our pool (coping). What a difference it has made. The color was not changed but the water does bead off and I hope that this prevents staining. Looks great. Easy to apply. I plan on using this on the stone for my grill.

as expected

Product is easily applied with brush or poured on and spread with a saturated paper towel. As it soaked in quickly, I kept adding and spreading the sealer until absorption was reduced.

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