i paid $300 (although i took off the calipers myself) for powder coating several years back. Keep in mind that powder coating is not very high temp (if memory serves around 400). Well a good break fluid is good for upwards of 500-550-600 degrees. So no need to change seals - they are use to those types of temps. Obviously you need to flush the fluids, but that is all of about 10 mins/corner.