Unfortunately, Great Stuff does not list waterproof as one of the properties of this product. In almost all their descriptions, the manufacturer says “expands to take the shape of cracks and voids to form an airtight, water-resistant bond “Click to see full answer. Similarly, you may ask, is spray foam in a can waterproof?Answer: Some spray foam insulations are waterproof. Rather, open cell foams can hold a tremendous volume of water. Lower density closed cell foams are water resistant, but not completely water proof. However, higher density closed cell foams can be water proof.Also, can spray foam get wet? Open cell spray foam insulation will still dry completely after getting wet. In addition, because spray foam is not a “food” for mold, there is little danger of mold becoming a problem even if it gets wet. Closed cell foams also do not absorb water, which is very beneficial in flooding zones. Also know, is polyurethane expanding foam waterproof? Polycell expanding foam is better than most, in fact it is used for waterproofing in the building trade. The one to avoid in any application that could get water in, i.e. below waterline, is REP (rigid expanded polyurethane) which is the one formed by mixing two liquids.Will Great stuff stop water leaks?The idea you’re pursuing is exactly correct seal the moisture out to prevent water damage. Unfortunately, Great Stuff does not list waterproof as one of the properties of this product. Rust and moisture resistant applies for superior protection from leaks and cracks.
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