Based upon a recommendation from this group awhile back, I started using this adhesion promoter on all my trucks after a quick clean with IPA, including the HGC Kadees. Eliminated my paint chipping problem. 

Dupli-Color CP199 Clear Adhesion Promoter Primer

https://www.amazon.com/gp/product/B0007UAXJQ
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RJ Dial
Mendocino, CA