. "The adhesive material 14 that is used must be of a special type that does not harden, remains flexible once cured to allow relative movement of the vinyl 10 against the insulating member 12, does not attack the vinyl 10, in order to prevent degradation, discoloration, deformation or other defects to the vinyl 10, and is compatible to both the vinyl and the insulating member over the long term." . . . .