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Old 12-04-2004, 03:29 AM   #1
TSINightFall
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Join Date: Apr 2002
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Location: Portland, OR
Vehicle:
2007 STI Limited
Urban Grey

Angry So I curbed my STI golds today...

..and it really sucks.

What is the recommended recovery method (how the heck do I fix it)? Just touch up paint?
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Old 12-04-2004, 10:03 AM   #2
minh
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my wife curbed one of mine. will either buy another or get them all powdercoated.
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Old 12-04-2004, 11:28 AM   #3
suby_dude
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depends how bad it is... i know some customers that have had wheels fixed... its about $100-$150, from the ones i have heard... per wheel...

w/ those expensive wheels... i think it is worth looking into.

if you know some folks that go out to track events... they should know company w/in your area that fixes rims.

just be sure there's no structular damage, and just for the meantime...

i've seen people use touch up paint... and even if the paint is from the manufacturer... for some reason, it never looks right.
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Old 12-04-2004, 10:50 PM   #4
TSINightFall
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It's not too bad. I don't think there is structural damange, just missing quite a bit of paint.....
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Old 12-04-2004, 11:55 PM   #5
Uncle Scotty
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DO NOT POWDER COAT FORGED WHEELS. It destroys their strength by altering the temper of the alloy.....bad juju.
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Old 12-05-2004, 08:21 AM   #6
minh
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Quote:
Originally Posted by Uncle Scotty
DO NOT POWDER COAT FORGED WHEELS. It destroys their strength by altering the temper of the alloy.....bad juju.
good to know.
thanks.
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Old 12-05-2004, 12:11 PM   #7
Zuffy
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Is there touch-up paint available for gold STi wheels?
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Old 12-05-2004, 03:55 PM   #8
minh
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Quote:
Originally Posted by Uncle Scotty
DO NOT POWDER COAT FORGED WHEELS. It destroys their strength by altering the temper of the alloy.....bad juju.
wait a sec... can you explain how powdercoating alters the temper of a forged wheel? isn't it just charging a piece of metal, plastic powder sticks to it, and it's baked to melt the plastic? details please for I am ignorant. perhaps in the way the aluminum is cleaned? washed and etched?
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Old 12-05-2004, 04:21 PM   #9
minh
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found the answer. (from http://my.execpc.com/~davewrit/Powder.html)

Found your article most enlightening. A metallurgist friend told me a few years ago that things like aluminum wheel spindles should not be powder coated. He explained that aluminum billet material (6061-T6 ?) changed crystal structure at a critical temperature around 410 degrees F (as I recall). The thrust was that the heating step would adversely affect the strength of the material. Non-structural components would be OK, but not something that "holds the spokes on". The metallurgist is correct. Products like wheel billets, scuba tanks, etc. can be powder coated, but only with powders which cure below peak metal temperature of 300 degrees F. The magic temperature is about 275F. The crystalline realignment at 400 degrees F causes the previous ductile aluminum to become brittle. Imagine the catastrophe when an 80 cu. ft. scuba tank explodes under 3000 psi pressure after an unauthorized powder coat (this actually happened). To my knowledge, all Aluminum wheels and other strength-critical aluminum components are powder coated with these cooler curing powders.

Heating Al alloys above this temperature causes a granular rearrangement of the metallurgical structure resulting in a significant change of bulk properties. The tensile strength of the metal is dramatically lowered, much like a stress relief anneal on a

steel piece would do. The resultant metal is not as strong, nor will

pressure vessels made of such treated aluminum (e.g., scuba tanks) hold near

the pressure that they were originally rated for. Since wheels are essentially load-bearing structures, they should never be heated like this unless the alloy is known to tolerate it well.
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Old 12-05-2004, 05:09 PM   #10
DrD
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Quote:
Originally Posted by minh
wait a sec... can you explain how powdercoating alters the temper of a forged wheel? isn't it just charging a piece of metal, plastic powder sticks to it, and it's baked to melt the plastic? details please for I am ignorant. perhaps in the way the aluminum is cleaned? washed and etched?
there are a number of different ways to powdercoat - one way is to heat the workpiece, then spray the material with the powder (with or without electrostatic assistance) another way is to do something called cold-spray, where you use electrostatics to hold the powder in place, then heat the workpiece to the desired temperature (to melt the coating)


As for the original question, unless the car is a show car, I would just use touch-up paint. If you can't find the right color (or something close enough) get a couple of different paints (gold, black, and silver) and mix until you find something that works for you. Wheels get beat up anyway - no point in fussing over every scrape - just clean it up, smooth it out, and use some touch up paint.
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