Yes, You can "finish" curing something. Now the hard part,.... How long should you cure it? The answer is "A Full Cure"
For future reference, almost all powders are overcure stable. As long as you're not over-temp, the curing time can be as much as double the suggested cure time. Yes, 100% stability in overcure in most powders.
The exceptions are Curing Light colors, such as white or light yellow. Over cure can actually discolor or darken those, and will sometimes Yellow a clear topcoat.
By all means, plan ahead on curing and over cure by just a little at least, on most parts. Save some testing time for what a white powder or clear can handle, before turing dark or yellowing. Do this on test panels, not your final part.



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