That temp. seems too high for the composite of the grills, but I don't know...
Were your grills professionally done and this problem occurred? Or if you did them yourself, did you use primer first?
Edit: Read your post wrong...Thought you already painted them and had a problem with the adhesion...
I've helped paint a few kidney grills for some friends E36's and have used Dupli-Color paint for all of them...
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