“I would like more information to answer why after application of powder coat on architectural aluminum extrusions the coat chips or peels off, even after we had applied chemical treatment. Please advise us on how to make better process. Hope to get your prompt reply. Thank you.”
“Loss of adhesion with powder coating can be caused by any of the following:
1. Poor surface cleaning.
2. Poor surface pretreatment.
3. Under cured coating.
4. Over cured coating.
To know what is causing your particular problem requires some detective work. If there is foreign matter on the under side of the chip, then your problem is in the pretreatment of the product. If the chip is clean, then check your cure. Good luck.”