The Metal - Prep that I have used leaves a zinc phosphate surface, I have only used one type from the auto paint supply, possibly other sources have a different chemical make-up.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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