The Marble Institute of America recommends sealing an exterior stonewall with an impregnating sealer. Impregnating sealers are absorbed below the surface of the stone. They are considered breathable, since they allow moisture below the surface to escape, but prevent moisture absorption. They have a matt finish and do not alter the stone's appearance. Topical sealers, while they are easier to apply and considerably more affordable, will yellow when exposed to UV rays and should be avoided.
- Skill level:
- Moderately Challenging
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Things you need
- Impregnating sealer
- Roller tray
- Superfine roller
Conduct a porosity test on the wall in question. Drop 1 tsp of water on the surface. If it is absorbed quickly, it requires treatment, but if it sits on the surface for a few minutes or more, the wall has probably been treated.
Clean the surface and allow it to dry. The surface must be free from any debris or dirt.
Pour sealer in the roller tray. Hold the roller and gently roll it through the sealer until it has absorbed a decent amount.
Apply sealer coat to the wall moving the roller in one direction only. The impregnating sealer should be absorbed within minutes. If there is no surplus to wipe off, additional coats are probably needed.
Apply additional coats, allowing two hours for the stone to absorb each coat before applying the next.
Tips and warnings
- Use of impregnating sealers is restricted in some states because they produce volatile organic compounds (VOCs). Check state and local regulations before using.
- Wear protective eye wear and a respirator when using this product.
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