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Flatness issue about powdercoated parts

Hi. We have aluminum 5052 parts which are to be black (glossy) powdercoated. Before painting, flatness is around 0.1 but after painting flatness is around 0.6~1.0mm which is undesirable since flatness is very important to our customer. The curing oven runs @ 200 °C, 10min. The shape is Ø200mm round with a Ø50 hole on the center(imagine a M3 flat washer enlarged 20 to 30 times). Thickness by the way is 1.6mm. The portion with remarkable warping is on the center of this washer-like part. My question is how can I improve the flatness of this part? Can I attain good flatness using different raw mat'l like steel or stainless? Or is there any other finishing method to consider? I had lowered the oven temp but it seems no any effect. Thanks.

Don Mar
Sheet Metal Fabrication - Bangkok, Thailand
2006

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