Sylglas Plumber Fix is purpose designed as a permanent leak sealant for piping and tanks and can be used on most materials EXCEPT soft plastic materials. Ideal for sealing weeping, sweating and burst metal pipes, radiators, tanks and cylinders. Plumber Fix is a two-part epoxy (with resin and hardener of differing colours so that when kneaded together, complete mixing is easily observed) that hardens to form a strong waterproof self-adhesive seal.