needs to be metel temp not even temp would recommend wheels to be left heating up for a good 30 mins at oven temp,cooking the powder off is 10 to 20 mins depending on powder should state coocking off time on packageing. dont try to put loads of powder on cos it dosent make the finish any different, some powders are base coat and need laquer as a top coat some are a high gloss one coat finish
if you need any help giz a shout
few pics of some work ive done