My paint shop used "Bulldog" on the piece in addition to sanding. They swore that no paint would stick to the bottom pieces without "Bulldog" for any length of time even with sanding. They did it all the way around and charged less than $150.
Any type of adhesion promoter will work. You spray it down, and then prime it, and then paint it. Theres generally no flash time with adhesion promoter as well.
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