This technology update provides a fundamental discussion of ambient-curing fluoropolymer finish coats applied to metal substrates@ including recent developments. It is intended as a resource for architects@ specification writers@ facility owners@ and others charged with the selection and field application of coating systems requiring superior weathering resistance and appearance retention in both architectural and industrial applications. It includes background information about the development of fluoropolymer materials@ a basic description of fluoropolymer coating technology@ the different types of fluoropolymers used in coatings today@ application methods@ and performance testing procedures