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No, it isn't always rust ... if, for example, the paint job is recent -- one year old, or less. It can be the result of moisture in the lines of the air supply hose to the paint gun when the topcoat was applied. And, it doesn't show up immediately after drying, either!
It can also occur because of contaminants on the primer if there was significant delay between primer and topcoat application!
Likewise, it can also be the result of inadequate cleaning and preparation of old paint, if shortcuts were taken.
Oh yes, there is also a malady unique to basecoat/clearcoat repaint jobs that shows up three-to-five years afterwards that I call the fish scale syndrome -- large patches 3-10 inches across, or larger that starts off as a few blisters in the clearcoat, and gradually grows to a uniform fish scale pattern just like a largemouth bass has! And, no, I don't know what caused it, because it was a professionally-done paint job in both of the cases I have experienced personally! Eventually, the clear coat flakes off in very small patches after repeated wand washes over a couple of years, revealing smooth basecoat underneath!
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Warren Hall
1973 911S Targa
[This message has been edited by Early_S_Man (edited 06-06-2001).]
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