Sealant manufacturer American Polywater Corp.’s FST-250 sealant is a two-part, high-expansion “closed cell” foam that is superior to duct putty and aerosol canned foam.
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Sealant manufacturer American Polywater Corp.’s FST-250 sealant is a two-part, high-expansion “closed cell” foam that is superior to duct putty and aerosol canned foam.