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March 27 - March 31, 2017

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?

Selected Answers

From Warren Brand of Chicago Corrosion Group on April 5, 2017:
Without doing any research, my understanding is that most fluoropolymer coatings, due solvent content, can be overcoated virtually indefinitely, so long as the surface is clean and dry and the same material is used. Yes, even if it's glossy. The high solvent content in the new material will soften the existing material, leading to a chemical bond, unlike epoxies and other materials which need to be scuffed or otherwise abraded in order to facilitate a mechanical bond, which, by the way, is never as good as a chemical bond.

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Tagged categories: Coating Application; Coating chemistry; Fluoropolymer; Paint application; Surface preparation

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