While ready-to-use polyurethane insulating foam sealant can help improve energy efficiency, this all goes out the window when confronted with a .308 round.
Kirsten Joy Weiss makes a huge mess on the prairie (which she promises to clean up) by taking out a can of liquid foam with her trusty SCAR. While the sealant is designed to take the shape of gaps and cracks, “creating a long-lasting, airtight and water-resistant seal,” when faced with sudden depressurization of its can, all of the marketing goes out the door.
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