Failure Analysis
Failure Analysis: When Metal Roof Coatings Fail

From D+D Print, March/April 2013

by Jayson L. Helsel, P.E., KTA-Tator, Inc.

The author describes a field and laboratory investigation of a premature failure of a fluoropolymer coating system on a galvanized steel roof. Both the failure and the solution provide lessons in chemistry and physics....
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Tagged categories: Coating failure; Failure analysis; Galvanized steel; Galvanized/thermal spray coatings; Good Technical Practice; Jayson L. Helsel; KTA-Tator; Metal roof coatings

Comment from Peter Gillies, (5/12/2013, 8:09 PM)

We supply quite a lot of fluoropolymer coating for gal but believe you must have a barrier coating of MIO epoxy or similar to keep out moisture which starts an electrolytic reaction under the coating. This reaction will eat away the zinc causing red rust to break out.

Comment from Jay Helsel, (5/16/2013, 2:54 PM)

Coating manufacturers typically recommend specific primers for their fluoropolymer coatings, some of which are epoxy materials

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