That's bollocks imo.
what he said ^
Did the problem go with the new rims then? So according to that reply, in theory, if the rim gets heavily covered in brake dust or mud which would reduce heat dissipation, the brakes would overheat. Not a good ad for high end BMW is it? Here's a gun, shoot yourself in the foot with it.
I can't say if its true for brakes or not, but when tig welding you can lay a piece of aluminium on the work to take heat away and reduce distortion/colouring.
Also does the M3 not have floating discs anyway.
If that's true, why isnt there advice out there to use thermal paste between the disc and wheel to maximise the heat distribution?
I had intermittent steering judder at motorway speeds that was actually caused by warped front discs. Nothing to with wheel refurb mind you Just shagged discs.only problem I can think of if there is too Mich paint on the mating surface is when it flakes off the wheel bolts/nuts can become loose. This I have seen on trucks but with hand painted wheels.