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I work for as far as I am aware the only bmw dealer owned specialist alloy wheel repairer as in we dont smart repair or blow stuff in. We have 2 hot acid strip tanks two different media blasters. Powder coating and 2 lathes and other equipment.

I strongly suspect the white parts on diamond cut alloys (some call this wheel worm) is due to 6 things the first is poor prep ie the wheel had wheel worm before and it was left a long time and ate into the wheel the lathe technician didnt cut all the corrosion out (usually around centre caps). Second is centre caps poor fit cheap materials create metal interference the bmws suffer with this and is known and dealer accepted warranty issue providing your wheels have not been refurbished,but does affect other manufacturers. Thirdly is neglecting to use an anti corrosion barrier I dont have the exact name for this chemical wise to hand but have it at work. 4th is the use of polyester powder lacquer vs acrylic powder lacquer and how you apply it, to thick and like any paint becomes brittle when chipped causing bigger damage and water ingress. 5th I have always believed the polyester is more susceptible to damage from brake pad dust which would be helped by cleaning. 6th is the sticker that is placed onto the hub to protect it and make sure your wheel bolts on properly stopping paint going here but doesn't allow material inside behind where the centre caps sit which is the same as a factory the wheel on a conveyor is only getting material from the face and even though its charged it does not always

I am just throwing in my 2 cents on what we see at work. Personally I dont like many diamond cut wheels I much prefer solid colours and I nearly always expect it to last longer.

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2006 R53 Hyper Blue/White Cooper S with Milltek etc.
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Dipping and powder coating really are the way to go. I've used Lepsons in the past, made my old Forester S Turbo wheels (which were well past their best....corroding and peeling like mad) look better than new. Half the trouble is having to have the wheels off the car and sent away for about a week (probably longer given today's circumstances). Was bizarre having to see my car sat on axle stands outside my mates garage whilst they went away.

A decent Smart repairer would do a good job on them and outside your home/work but it's not quite the same as a dip refurb.....depending on the skills of the person carrying out the repair they'll probably get a similar quality finish....just possibly wont last quite as long. I'm having mine done by a smart repairer this time but only down to the convenience and it being very good value for money.
 

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Discussion Starter #23
The wheels are off the car now as I managed to get a set of 18" twin spokes but will only be temporary for me as not to my personal taste. I just want to make the right move and I do like the original wheels.
 

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I too like the R98's, but they don't fit over my brakes now so have advertised them, not cheap but guaranteed they come apart and still look good since refurbished despite having one 'nick' and some tiny blisters from track use and the heat of the brakes. I was just keeping them as originals for when I sell the car or return it to stock or something but I have R112's so it can go with those if I do ever let it go.

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