Boy, thats a tough one to fix. Your best bet is to have some powder overnighted to you and put on an entire second coat. The metallic in the powder makes it almost impossible to spot repair, in my experience. Depending on the gun used, I have found that I have better experience shooting a second coat "hot". I powder coat a lot of bicycles:
http://www.andersoncustombicycles.co...%20Coating.htm
and so work with stuff thats sort of similar to what you are doing, etc.