Not sure whether Mini wheels are stove enamelled or powder coat. Powder coat melts at a higher temp and is much more durable .
Pad material makes a big difference to potential wheel and body panel damage ,Read on;-
For example if you use Ferodo DS3000 the dust material sticks (welds) itself to the alloys, nothing short of abrasive paper will shift it! If that sounds bad read on further!
If you use 'Black Hawk' pads the pads hardly wear atall, what happens is the disc wears and the red hot metal swarf magnetises and sticks to the wings & door panels,melting the paint to the bare metal in the process!
PS Both of these are full race pads . The best braking coefficient by miles. Makes greenstuff etc. feel like they are made of marshmallows.
Regards Roland Gt Tuning