LOCTITE PC 7218 is a 2-part, grey, epoxy-based surface coating for metals. Ideal for protecting against coarse particle abrasion or erosion, or for rebuilding worn parts.LOCTITE PC 7218 is a 2-part, grey, ceramic-filled, trowelable, epoxy-based surface coating designed to protect parts from coarse particle abrasion or erosion on metals (with or without chemical attack). It is designed for parts such as cyclones/separator bodies, dust collectors/exhausters, pump liners/impellers, fan blades and housings, chutes/hoppers and elbows/transition points.