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Mag Wheel refurb

richardrimmer

PCGB Member
Member
Just recently got round to having my wheels re-done as the tyres got to the stage of needing replacement.

Having done a bit of research I bought a set of Pirelli P-Zero Rossos as I use the car on the road, not track.

I decided on having the wheels powder coated after speaking to a company oop narth that seemed to have a good reputation with mag wheels. Rich C. had his done by Pristine Wheels who, whilst seemingly thorough, use a wet paint application and his started bubbling back up within a very short time.

My wheels didn't look too bad, with only light bubbling on the front of the spokes. The back I believe was the original finish. However, one wheel was apparently quite rough under the paint so beware if yours are starting to show signs of bubbles/pickling below the paint. The wheels had been re-done about 10 years ago through a Porsche Centre, and had never really been satisfactory.

On collecting the wheels and attempting to re-fit them, one refused to fit. The powder coat was too thick where the disc centre fits. The centre cap also refused to fit! The company said they'd have another go so I returned the wheel to them (another day plus a tank of fuel). On collecting the wheel today, the solution seems to be scraping the coating where the centre fits and grinding the back of the wheel out (back to bare metal). So much for re-doing it! It kinda defeats the object of re-finishing a wheel if you then expose bare metal doesn't it.

I was prepared to put up with the slight colour mis-match between the wheel and centre cap as long as the wheels were protected, but now.....?

The non-fitting cap was blamed on it not having a 911 part number but having spoken to a Porsche parts dept. I'm told they've been that diameter for many years so all should fit (especially as the other three did!). Does anyone know any different.

As an aside, what centre caps came with the RS originally? Mine are plastic with the Porsche crest in black and have been on the car at least 12 years.

I'm waiting for a response from the company as to where I go from here, but so far, these must be some of the most expensive re-furbed wheels ever!
 
I found when doing the wheels myself that the disc to wheel clearance is very small & "solved" the problem by priming the wheel in this area & then masking to avoid the thickness of the top coat. I also keep this area of the wheel coated in copperslip. No corrosion problem so far after 12 months.

Center cap clearance was a problem as they tended to damage the new paint so I now don't fit them.

Pete
 
had problem with pristine with mine,bubbling etc proper bad job and assholes afterwards

centre caps were tight then as there was so much paint,i think they came with metal caps with silver porsche inset not black?

the guys that redone mine recomended not filling any of the imperfections and using as little paint as possible,have to say they dont look great as you can see some of the pin holes as all magesium rims will have some day,paint finish good... just fussy

havent put them back on yet as they are such a pain of a wheel for all this stuff
 
You can powder coat, oven gets to about 150- 180C, however I beleive its the prep that matters and you should only get refurb done where people know how to treat Magnesium. i.e Acid Dipping, Bead / Sand Blasting if done as per alloy there will be little left of the Mag wheels.

ORIGINAL: ruane

don't think you can powder coat Mag wheels !
 
Powder coating does seem to be the best way as the moisture and chemicals in wet paint starts the corrosion process straight away? Acid dipping is also seemingly a bad idea so blasting is the only real option.
The company I used leaves the wheels in the oven for a few days to thoroughly dry them and imperfections aren't filled, only welded if really necessary. The over application of powder coat was probably an attempt to get a better finish on a pitted wheel.

Still not sure on the wheel centres!
 
ORIGINAL: richardrimmer

Powder coating does seem to be the best way as the moisture and chemicals in wet paint starts the corrosion process straight away? Acid dipping is also seemingly a bad idea so blasting is the only real option.
The company I used leaves the wheels in the oven for a few days to thoroughly dry them and imperfections aren't filled, only welded if really necessary. The over application of powder coat was probably an attempt to get a better finish on a pitted wheel.

Still not sure on the wheel centres!

When I bought my RS 3 years ago it had the Black Porsche crest as wheel centres on the mags. I have since changed them to the RS items on Cup 1 Alloys. I had assumed it was standard issue for the Touring derivative.

 
Powder coating the mags works if done well - but requires a lot of hand finishing to get a good result. As far as the wheel centres are concerned all Porsche's launch photo's and the uk press car (SMO) had plain silver centres - and if mine are original they are metal.

Tony
 
Rich -as I said at Blenheim, the contact points to the disc hub on the wheel should be bare metal -put some copper slip on before fitting to prevent them sticking!! And sorry, but that colour ain't right.....[:eek:]
 
Hi Mel,
agreed on the colour but there wasn't a great deal of choice! Looks worse as the caps are lighter.
Following on from the poor fitting of the front wheel, the wheel was returned to York (another lost day) for re-finishing. The wheel was left in Kettering area the following weekend for collection (another half day lost). On collection, I find that the "solution" had been to grind away the powder coating (and some metal) on the inside of the wheel to clear the disc and similar tratment around the centre cap.
This is the only treatment on offer by the firm. No refund was offered to compensate for my time/travel and a courier was only suggested after the event, so less than impressed really
I'm told that copaslip on exposed metal is acceptible and that's how it would have come from the factory but my wheels had the original paint on the inside and that covered all surfaces!
All I can say is that I now know of two companies not to recommend!
 
I don't like to slag off companies but at the end of the day the job wasn't up to standard and no remedy was offered, so.....

Take a bow Ian Jemison Engineering of York!

If it saves anyone else wasting their money......

The other company has already been mentioned by others. This one is a shame as they seemed to be very thorough when the 964 register paid them a visit. Sorry Pristine of Woburn Sands.

 
Sorry to hear that Ian didn't do it for you Richard.

He's done two sets for me --- so far so good --- 'had to be re'done (--- since we are naming and shaming) because Diamond Styling left me with two sets of wheels on which the paint, literaly, fell off.

Ask me in a couple of years how they are, but Ian has been specialising in Mag wheels for many years and does all the repairs for Pristine ....

He also bakes them in the oven for a long time to completely dry them out before a final "dry" cleaning process and priming and coating.

I can't say that the silver of my best set is the exactly the same as Porsche' Original, but I'll happily settle for the paint staying put and the wheels remaining weather tight. So long as they do !



 
Hi Chris,
I used him because he seemed to have a good reputation and, as you say, bakes the wheels for a few days etc. Just not impressed overall sadly.
I agree on the colour thing too, was more interested in protecting the wheels, it just added to the overall dissatisfaction!
Richard
 

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