Repainted galvanised panels

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Sun 13 Apr 2008 16:34
Repainted galvanised panels - Kostic
I am wondering what happens to the zinc layer on a galvanised panel when it gets repainted. I mean not due to an accident, but for instance under paint warranty due to a manufacturing defect in the paint. How can they remove the old paint without damaging zinc layer? Would it not affect corrosion protection of the panel?

Kostic
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Sun 13 Apr 2008 16:54
Repainted galvanised panels - martint123
From what I've seen they don't take it down to metal, never mind grinding the zinc off.
Even if they do, modern etch primer is pretty good stuff - I experimented by putting some on the hubs of my new, shiny brake discs on the front - still there and no surface rust, unlike the rears after a couple of years.
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Sun 13 Apr 2008 17:56
Repainted galvanised panels - steveo3002
yes for light surface damage the original paint is just lightly sanded and painted over

heavier damage that requires grinding and sanding to bare metal will remove the galv coating and rust may set in sooner than an original panel....you often see older audis that have one rotten arch or door bottom where its been repaired and the rest of the orig paintwork is still v clean

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