imoutohere t1_iwckjzm wrote
We use a product called drylok it works pretty well and it would be perfect for your application.
Darkn3ssVisibl3 t1_iwefhqm wrote
While not a perfect moisture seal (dry lock is not waterproof), it’s the opposite of what OP is asking for - a breathable paint. Another comment has recommended anything suitable for masonry, which is what they want.
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