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"Cracking or crazing of powder coating"





January 7, 2010

I need a second opinion on a defect reported by one of our clients to whom we supply powder. Has anyone an explanation as to why a polyester clear coat crazes a few weeks after being applied during the assembly stage? The substrate is mild steel which has been shot blast prior to any powder being applied. Placing the components back in the oven will normally rectify this type of problem. unfortunately, my previous experience was with alloy wheels and the defect occurring on the same day. Could it be under cure and when stresses occur at the assembly stage cracking and not crazing is happening?

Terry Hickling
Powder mf - Birmingham UK
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