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imoutohere t1_iwckjzm wrote

We use a product called drylok it works pretty well and it would be perfect for your application.

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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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