Oh yes, another thing i've picked up on. I NEVER coat over a existing coating, unless its a coating I personally applied via powder. I find that once heated, the older coatings peel and decinigrate, not giving a good adhesion to the subtrate. Also when you do blast off the old paint from say a valve cover, make sure you get it all, even that little tiny bit in the corner you missed. Once heated that piece will flake up, and give you bad adhesion. In the long run it will cause your powder to flake, and give grease and oil a place to get under the coating, which is not good.
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