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Cracking aluminum and powder coating

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When we try to powder coat an aluminum cylinders, approximately 4" in diameter, they crack during the process. Any ideas why?

Stephen Murphy
Manufacturing - Houston, Texas

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Need a bit more info. At what stage of the process do they crack? What pretreatment are you using? What cure temp? time? Whats the cylinder? thick wall, thin?

Geoff Crowley
galvanizing &
powder coating shop
Glasgow, Scotland

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