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Using Geocel 2315LRF (*see UPDATE below), applied with a brush, and Foundation Armor SX5000WB, applied with a pump sprayer, to seal stone veneer. Every couple of years, when there are a few consecutive days of really heavy rain, we have issues with water seeping through the stone veneer on the outside of our house. I've tried sealing with caulking and diverting water away from the stone with flashing, but nothing has stopped the leak. These 2 professional products are probably my best chance at fixing the leak. See the links below for the products I used:
UPDATE 4/19/2023: This solution worked for around 2.5 years but then we noticed a new water spot after days of heavy rain. I originally thought water was soaking through the stone, but it was actually getting behind the stone veneer because kickout flashing wasn't installed by the roofer. Geocel's plastic-like coating caused the water to become trapped. Since the water couldn't easily escape, small spots on the face of some of the cast concrete stones started to deteriorate. I think the Geocel would have worked well at keeping the water out but, since it was able to get in elsewhere, it ended up trapping moisture in the stone. The stone was removed to replace rotted sheathing, kickout flashing was installed, and new matching stone veneer was installed. I waterproofed the new stone with more Foundation Armor SX5000WB.
Geocel 2315LRF (1 gallon):
amzn.to/3k7ni51 (affiliate*)
Geocel 2315LRF (1 quart):
amzn.to/3452SUA (affiliate*)
Foundation Armor SX5000WB (1 gallon):
amzn.to/3k7nsJF (affiliate*)
Foundation Armor SX5000WB (5 gallon):
amzn.to/3s9BMF2 (affiliate*)
*Purchasing from these Amazon affiliate links earns my channel a small commission. Think of it as a tip that doesn't cost you anything. Thanks for the support!