October 28 - November 1, 2013
Can fluoropolymer coatings that are still very glossy be overcoated (if, for example, the topcoat is losing color or the color needs to be changed)? If so, what type of coating can be used, and what surface preparation is required?
Peter Gillies of A & I Coatings on
November 4, 2013:
I agree with Stephen. Air-dried PVF3 coatings can be easily abraded to achieve a mechanical bond. On PVDF coatings, we have found a CPO based tiecoat to be the best.
Stephen Burdick of Akzo Nobel Coatings, Inc. on
October 29, 2013:
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Yes, there is a method for refinishing fluoropolymer coats. One option is to first abrade the coating, usually with 220 grit sandpaper. If this is not possible or impractical, then an adhesion- promoting tiecoat is needed. Exterior PVDF coatings should be cleaned by powerwashing and rinsed to remove environmental contaminants. A tiecoat can then be applied. Adhesion should be checked before application of any topcoat. The best tiecoat is a vinyl urethane, although there are some bonding primers that are also suitable.
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