I had my M3W front wheels powder coated with absolutely no issues but they weren't tubeless. The baking temperatures vary but mine were taken to close to 200°C. The sealant that MWS use on the tubeless wires they supply to MMC (Dowsil 1080) is good to 315°C so you should be ok. Worth checking with the coaters though. I highly recommend
GKL powder coating near Snetterton circuit both for quality of work and prices.
