Panels will or should be gel coated anyway. If it's for painting then they are usually done in grey or white gel. There is a painting specific gel which is easier to sand but costs a fortune.
If you want a metallic finish then specify the colour you want in gel and pre fit it to your car then once happy with it all flat it off and use metallic clear coat and you have metallic finish from a gel original.....But the original finish needs to be top notch as if just used as a polished finish.
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