Pre-formed Scotch-Seal-Mason 5313. Pre-formed, self-adhesive synthetic elastomer sealants that adhere to a range of surfaces such as plastic, metal, glass, concrete, etc. Their strong adhesive properties allow them to instantly attach to the surface and the sealant stays in place without being held in place become. They are not polymerizable and their properties do not change after aging over long periods of time in a variety of environments.