Thompson\'s Emergency Leak Fix is a high performance clear sealant, which seals and repairs virtually any exterior surface, providing a long lasting, highly durable waterproof repair. The unique formulation adheres to most surfaces even in damp conditions to form a waterproof seal that remains flexible over time protecting against cracking and splitting. Ideal for sealing doors and windows the unique formula has been developed to be over-painted with solvent-based or water-based paints and stains. Usage Areas: Wood, painted surfaces, glass, uPVC, plastics, brickwork, stone, roof felt, slate, tile and zinc.