C.L. Industries PERMKTEGRY 80 lb Gray PermaKote Bonding Agent. CL Industries PermaKote is a one-part polymer-modified, cement-based coating specially formulated to increase performance and save time during application. Acting as a bonding agent and scratch coat, PermaKote delivers a superb link between properly prepared substrates and new plaster coats. PermaKote eliminates the need for excessive pool substrate preparation such as sand blasting and stripping. More importantly, it provides the even hydration (curing) of plaster applications, which is especially beneficial when applying swimming pool plaster or any cement coating.