This quick leak repair putty is suitable for copper pipes, radiators, tanks and cylinders, not suitable for plastic pipes and fittings. Simply apply and leave to dry. It can be painted in wet or damp conditions and sets in minutes, even under water. EVO-STIK Plumber's Mait Quick Leak Repair Putty provides instant repairs for pipes, radiators, tanks and cylinders. Suitable for copper pipes. Simple to apply, the putty is formulated to set in minutes so can be applied to wet surfaces, and even underwater - negating the need for the system to be drained. Once dried, it can be drilled, sanded, machined and painted. Features & Benefits: Instant repair putty. Sets in minutes. Can be used underwater. No need to drain the system. Waterproof.