| abstract |
A coated substrate comprising: (a) a substrate; (b) a primer layer containing adhesion-promoting polymer on said substrate; and (c) at least one topcoat of a permeation resistant composition of ethylene-tetrafluoroethylene (ETFE) copolymer and mica, therein the ETFE is a copolymer of about 40 to 60 mole % ethylene and about 60 to 40 mole % tetrafluoroethylene, wherein the mica is present in amounts of about 3 to about 25 wt % based on the ETFE and mica, and wherein the topcoat having a thickness of at least 150 mum. The coated substrate is formed by applying the primer to the substrate and drying, followed by dry powder coating at least one layer of ETFE and mica composition, followed by heating said layer. |