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I had thought the paint on these cars is water based. This would explain the poor adhesion, and easy stone chipping. One of my fellow club members told me he's certain the paint is water based.
Many years ago Dana in Lancaster used to paint the chassis and all assembled components on them for Mack Trucks. It was all petroleum based. Mack decided to go with water based because of the reduced costs. It was a nightmare for our painters. The water based paint on them was terrible, it just wouldn't hold. All kind of back charges were incurred because of it but it wasn't the prep or the painters it was the product. I believe once Mack took the painting back in house they switched back to petroleum based.
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