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Topic originally created by Ian Levy on December 3, 2014 10:35 PM and viewed 1805 times in the old forum.
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Originally posted by Ian Levy on December 3, 2014 10:35 PM
Hello I need to refurb my cromodora alloys. I did them last about 10 years ago & the rot is appearing again under the paint. I went through a complete process with gentle media blasting,then the Alo-chromate conversion process before painting but the rot is back. Is 10 years about right for a low mileage car or is there a better way? Any one had the wheels powder coated? Regards Ian L Manchester UK -
Originally posted by Mike Meehan on December 4, 2014 1:17 AM
Hi Ian, I did mine about 4yrs ago and still perfect but that is far short of the 10 yrs for yours.I think there is a certain inevitability for paint failure with magnesium due the gassing of the metal.I heard cautionary tales about powder coating as it might mask cracks that one might otherwise notice.All the best,MikeComment
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Originally posted by Tom Welsh on December 12, 2014 1:31 AM
Hi Ian, Before restoring my wheels I checked every web entry I could find on the subject. Removal of the original chromate by blasting was a problem because it was banned here in the US. Heat from power coating affect's the metallurgy. I hand sanded to keep as much of the chromate and used Mercury Marine Primer, then painted with the original toxic lacquer finish. You might have seen my post. Only an expert welder can replace lost material on the wheel. I found that the marine primer is also used by small aircraft restorers on their magnesium wheels. If the repair lasts another 10 years, the car or I won't be around to worry about it. It's not going to stabilize, so you have the right idea to take care of it, however you do it. Regards, TomComment
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Originally posted by Ian Levy on December 12, 2014 6:00 PM
Hi Tom Thanks for the advice & encouragement. Thanks to Mike & yourself for the powder coating NO NO. Is Mercury the manufacturer of the marine primer as I need to find a UK equivalent. I can get the media blasting done here it what I do next that is the problem. I have been looking at a site by Steve Kouracos who seems quite well informed at stevekouracos.com Thanks for the advice I will let you know Regards Ian LComment
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Originally posted by Tom Welsh on December 14, 2014 2:01 AM
Ian, I went to the basement and pulled the primer can. This was bought at a Mercury outboard dealer and I was surprised that it's a Evinrude Johnson product. Zinc Phosphate Primer (Extreme Danger) P/N 777172. Tom I have a picture of the can but lost the option of uploading for some reason. Image icon gives me this [img][/img]Comment
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Originally posted by Ian Levy on December 15, 2014 1:48 AM
Thanks Tom I can't get this stuff exported to me from the US so I need to find the equivalent You can send the pic as an e mail attachment to [email protected] if you would be so kind. Was it an aerosol that you bought? Thanks Ian LComment
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Originally posted by gudz on January 27, 2015 5:14 AM
Hi Ian, Sorry for the delayed response not been on the site for a while. I got my Cromodoras done at a place call Pristine Wheels, just outside Milton Keynes, and they did a cracking job. Apparently magnesium wheels are a bit tricky as the surface underneath is pretty rough so they have a secret process to smooth it off first. Anyway, I was really chuffed with the results, and they even managed to keep the embossed lettering (I've heard story's of the lettering being lost in the process). Granted, the lettering isn't quite as sharp as it was. but the silver finish is an exact match. I'll email you a pic direct. FYI, cost me just under £100 per wheel. SteveComment
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