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.
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.