I'm debating whether or not to powder coat my wheels.
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Your wheels will not crack from powdercoating. Powder is cured at 400 degrees or less and for only 15 minutes or less. This is not high enough heat to fatigue the metal at all. I have been powdercoating wheels for over 4 years without ever having one issue and know people that have been doing them for over 20 years without issue. I've spoken to 3 metallurgists who have also confirmed that in no way will powdercoating fatigue the metal. A lot of wheels from the factory and aftermarket companies are powdercoated now instead of painted.
I was going to have my X wheels powdercoated until I found out about annealing that occurs during the heat treatment. There is embrittlement of the aluminum, which can cause it to crack or worse, break off spokes. I do understand that there are powdercoaters out there who have a lower temp curing oven so that annealing does not happen. I ended up Plastidipping my wheels and I feel they turned out really well. It is an option worth looking into.
I was going to have my X wheels powdercoated until I found out about annealing that occurs during the heat treatment. There is embrittlement of the aluminum, which can cause it to crack or worse, break off spokes. I do understand that there are powdercoaters out there who have a lower temp curing oven so that annealing does not happen. I ended up Plastidipping my wheels and I feel they turned out really well. It is an option worth looking into.
All powdercoating is done at the same temperature, if you try to cure them at say 800 the powder will burn right off. All coaters use the same type of oven essentially. Most heat treating is done over 1000 degrees for 3+ hours The one guy I spoke with gave me some of his technical data charts that dealt with softer metals and cast pieces. I will try to dig it up to scan on here. I researched this topic pretty heavily when I first started coating 4 years ago to make sure I wasn't potentially putting someones life at risk by doing so. Basically what it boiled down to is the temp and the time that powder is cured at is all way under anything that would fatigue the wheel.

I tried to research the subject and found that there are ovens that cure at a lower temperature. I can't find the companies who do it right off hand, but I did find some discussion about it:
http://forums.pelicanparts.com/porsc...um-wheels.html
https://www.evolutionm.net/forums/ev...en-wheels.html
http://www.pcimag.com/articles/dsm-l...olyester-resin
http://www.hercules-online.com/catal...uring_156.html
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