Help me figure out what I did wrong? ew wrinkle black bubbled up?

[Powderwerks]

I Just powder coated a Valve cover with eastwoods black wrinkle and it didnt turn out well at all. I sandblasted the valve cover before I coated it. I didnt wipe it down with anything and powder coated it cold and then put it in the oven and it was preheated to 450 then waited for it to flow out and dropped it to 400 for 20mins. I started to bubble and looked like this when I pulled it out… The cutomer had the same problem when he painted it. Please let me know what I did wrong.

[Author]

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