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Join Date: Jul 2003
Location: England
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Re spray advice

let me set the scene....

A year ago I had a full re-spray done to my car. It did not have any signs of corrosion.
4 weeks after the re-spray a bubble under the paint appeared which the specialist rectified for me at no charge.
2 months after that it came back again which the specialist again rectified at no extra charge. The problem is still there in the same area.

The specialists claims this to be corrosion, but I am a little confused.

If the car was prepared correctly surely they would have noticed at this stage. If they did not notice, I would assume that the onslaught of corrosion would be delayed - not sped up!

My question is - can non-surface corrosion be so quick to present itself and how can the said specialist prove to me that it is corrosion and not just a badly prepared and painted wing.

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Jay
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Old 07-30-2005, 12:03 PM
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if you do not address it at the bare metal stage it will return..might have to assid it out
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Old 07-30-2005, 12:29 PM
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THAT is worrisome.

Something is not right there. Can you post pictures?? Where is the problem...always in the exact same spot?

Is the painter experienced?? Is the shop well environmentally controlled? (Ie, good humidity and heat/ac controlled?) Are proper primers being uesd?? Definately things that you'll need to have a good handle on.

It might not be corrosion, but perhaps a chemical reaction of some inbedded and reactionary compounds, and that needs to be considered as well. The repeated nature points to such a situation, but it is worrisome to determine the exact cause.
A "second opinion" might be in order in this case.
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Jake Gulick, Black Rock, CT.
'73 yellow 911E , & 2003 BMW M3 Cab. Ex: 84 Mazda RX-7 SCCA racer. did ok with it, set some records, won some races, but it wore out, LOL[/B]
Old 07-30-2005, 12:33 PM
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Bottom line: they screwed up. The car - or portions thereof - needs to be taken down to bare metal and done correctly. I am sorry to have to tell you that. My car had the same problems.
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Old 07-30-2005, 02:34 PM
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Porsche metal is weird...like said every bit of the corrosion has to be dug out, acidly removed, or it will bother you latter
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Old 07-30-2005, 03:25 PM
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Get a new "wing".

Very, very, light corrosion can be acidly removed. Otherwise it requires amuputation or it will haunt you.

BTW: Most cars rust from the inside out. The corrosion is usually at least 10 times worse than what you see.
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Old 07-30-2005, 03:34 PM
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wild guess is that the fix wasn't down to metal.. that there may be some chemical off-gassing still happening? In the days of lacquer paint this was an issue if primer was shot to thick and paint applied before the primer set up.
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Old 07-30-2005, 05:00 PM
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my guess is water in the spray gun lines...

sorry to say this...
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Old 07-30-2005, 05:45 PM
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Or a hole completely thru the panel. You cannot bondo over even a clean, sandblasted or acid treated (where did you guys come up with "acidly" and "assid?" Huh? ) perforation in the body. Moisture will work its way in and under the paint. I learned this the hard way a long time ago. Now I take a light behind every panel in a dark garage to look for pin holes.
Old 07-30-2005, 06:29 PM
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thanks guys. The offer on the table is for the specialist to replace the wing at cost for me - I guess it's not all bad!
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Old 07-30-2005, 11:42 PM
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He seems fair, but I am very suspicious as to the cause..

In other words, if he can't get the wing right, are you sure the quarters will be OK in a year??

I would want to know exactly the cause of teh issue, and I'd like to feel better about it being a one time situation..or two time.....
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Jake Gulick, Black Rock, CT.
'73 yellow 911E , & 2003 BMW M3 Cab. Ex: 84 Mazda RX-7 SCCA racer. did ok with it, set some records, won some races, but it wore out, LOL[/B]
Old 07-30-2005, 11:46 PM
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Quote:
Originally posted by lateapex911


, are you sure the quarters will be OK in a year??
he should buy a spray gun..

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Old 07-31-2005, 12:34 AM
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