BU-SEAL 32-17 Acrylic Sealant is a specially formulated water based, Acrylic Duct Sealer for both indoor and outdoor use. It is a Non-Flammable product that provides permanent flexibility and has excellent water resistance and sealing characteristics. Application: Used as a Duct Sealer for indoor and outdoor use and also is suitable for low to high pressure metal Air Distribution Systems. Shelf life: 12 months in unopened original packing, if stored properly.