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Old 11-16-2011, 05:19 PM
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Joe_Knesek Joe_Knesek is offline
Motorized Bicycle Member
Join Date: Oct 2011
Location: Lyndhurst, Ohio
Posts: 40
Default Re: What caused this?

It looks like oil contamination which will repel the primer. Alcohol will not remove silicone based oil. You should use an acid based conversion coating such as DuPont 5718S.
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