MOLD IT. SHAPE IT. SEAL IT. Flex Seal Power Putty is a flexible, moldable rubber sealant that grips tight on most surfaces to instantly seal gaps, cracks, and holes. Easy to mold and shape by hand, it conforms to virtually any shape or surface - no mixing, no curing. Plus, Flex Seal Power Putty can be removed, repositioned, and reused for hassle-free repairs at home or on the go. All the sealing power of Flex Seal, in the palm of your hands! WORKS ON: metal, wood, fiberglass, glass, plastic, PVC, brick, concrete, painted surfaces, and more. EXCELLENT FOR: sealing around pipes and plumbing fittings; filling gaps and holes; HVAC duct sealing; window and door frame gaps; roof and gutter repairs; basement and foundation cracks; pool and spa repairs; electrical conduit seals; dryer and exhaust vent seals; RV and marine repairs; and more.