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How did you poweder coat your valve covers without getting any bubbles from out gassing? I've tried mine and had problems.
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In this picture I had a lighter grey smooth powder on. No out-gassing bubbles at all, but the color just was not what I wanted.
I have since gone to a dark grey wrinkle. Just like my coater warned me, I have a few bubbles from out-gassing. Not too noticeable so I just ignore them. Lesson learn is: 1) if you want to do black there is a special anti-out-gassing powder for castings so go with that; and 2) smooth textured powder does better than wrinkle as wrinkle starts to cure on the outside and traps the out-gassed air in the curing powder.