So i powder coated my jigs today for the first time. They were supposed to be baked for 20 minutes. I kind of forgot about them and they cooked for 1.5 hours at 350. The finish looks great. Do you guys think that additional time will harm the integrity of the hooks?

I'd say no

Depends on what the weakining of the hook temp is but i say no as well.
Posted from my iPhone/Mobile device

the paint will just chip of easier

rob , did you use the stuff i saw at bass pro they are calling powder coating? you just heat what ever it is and then paint it. or did you do the static charge then bake it?