Old 01-11-19, 10:05 PM
  #16  
mtbikerinpa
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Bikes: 92 Giant Sedona ATX Custom

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Definitely agree with the latter assertions about the filiform being surface. On a car, it is usually from within but I have yet to see a bike frame come from within. Usually it is the result of a bad primer adhesion or a pinhole nick in the paint protection that allows the moisture or corosion process to wick along under sub par finish.
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