Rain Guard Water Sealers CR-0401 Micro-Seal HD READY TO USE HIGH SOLIDS Sealer Covering Up To 300 Sq. Ft. All Masonry Surfaces. 1 Gallon Clear Penetrating Silane and Siloxane Professional Grade.

The brick we have has a sort of concrete skim to lighten the brick color and add character. When water hits it, it darkens immediately as the water is absorbed like a sponge. After applying Micro-Seal HD with a simple sprayer, water repels completely. No change to the color of the brick either, which was important. TBD how long it lasts, but if it lasts even half of the 20yr guarantee, I’m a happy camper.I expect to no longer need to bleach algae stains and given how much water that brick is able to absorb, I’m pretty sure this added life to the thin brick from the freeze-thaw cycles in winter... or if there’s an break in the house wrap underneath.I bought 2 more gallons after the initial gallon. It’s a little pricey, but appears to be well worth the investment. If only all house projects were this easy!