To a wide range of dry, dust free solid surfaces - painted wood, metals, ceramics and plastics. Its primary purpose is for hole filling, and sealing purposes between two materials. Some working of the putty before use may be necessary to improve formability and can be directly pressed into place to form a permanent seal. Porous surfaces will need to be painted, sealed or primed before applying Plumber’s Putty in most instances. Bostik N49 primer can be used on brick, concrete, wood etc while the best primer for plastic.