the down side to powder coating in my rustbelt experience is the lack of creep resistance. although you can purchase creep resistant powder coating supplies almost no one that i know of uses them. take a look at trailer hitches to see what i mean. the powder coat comes off in sheets after the rust creeps underneath and the pressure exerted between the steel and the powder coat peels the powder coating off. creep resistance is a standard coatings industry test criteria and in my opinion is one of the important factors in choosing a paint that will live in a salt spray or other corrosive environment. sure in perfect world a super hard powder coat is the best, its low VOC, extremely cost effective to apply because of the absence of over spray, and the thick build up hides surface imperfections in one pass. but in my world things get scratched, no matter how hard the coating is and once that happens you want something that has creep resistance unless you plan on stripping things down to bare metal and redoing things every couple of years. or if you garage your powder coated vehicle in the winter if your locality uses road salt. jonathan |
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