Ken Cottle used DuPont Durethane when he finished the plane in 1987 and it looks as nice today as it did then. It's been hangared continuously, so that helps. I would imagine UV will kill anything given enough time, but no KR owner would ever leave their plane outside except overnight when travelling so I guess that point isn't relevant. Anyway, Durethane will do the job. Still looks like new.
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