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I have owned vehicles with both painted and powder-coated brake calipers and observed no measurable difference in durability or wear characteristics between the two finishes; both performed equally well over time. One key advantage of conventional high-temperature caliper paint is that the caliper assembly can remain intact during refinishing—there is no requirement to remove the pistons or internal seals.
Powder coating, by contrast, requires curing the coating in an oven at elevated temperatures. Exposure to these temperatures can compromise elastomeric components, so the calipers should be fully disassembled and, at a minimum, all seals replaced. This additional disassembly, resealing, and reassembly increases both labor time and parts cost, which can significantly raise the overall expense of powder coating.
The quality of the materials and workmanship is very important is making comparisons. The cost difference is also significant.
Yes I 100% agree. I have seen a many times at my local detail shops cars side by side like Lamborghini's where the brake calipers have had rattle can paint jobs on the brake calipers and then brake calipers that have been removed and powder coated. There really is no comparison. They are night an day miles apart on the finish. The powder coat is way better and they only get them powder coated out of convenience due to them getting wheels powder coated.
Now that being said. You are exactly right. Its all about the prep of the brake calipers etc. There are also brakes in the same shop that have been professionally painted. IMO that is the preferred method. They are also removed and thoroughly cleaned like the powder coated process and sprayed and baked on. This is my preferred finish and look like OEM. However most people usually compare a rattle can job to a powder coat job. Not saying a rattle can job cant be nice, but as you say. Its all in the materials and workmanships.
I have a buddy who was a career metal worker and did both processes in his career. He told me in durability and finish both are the same. The difference he noted was when painting prep time is everything, but if that step done right painted will be just as good. With calipers I preferred painted as I could do it on car without removing the calipers. I used paint specifically produced for heat/calipers. I normally sprayed, but even used the self leveling brush on as well. I unbolted the calipers and hung on wire to paint.....
I have a buddy who was a career metal worker and did both processes in his career. He told me in durability and finish both are the same. The difference he noted was when painting prep time is everything, but if that step done right painted will be just as good. With calipers I preferred painted as I could do it on car without removing the calipers. I used paint specifically produced for heat/calipers. I normally sprayed, but even used the self leveling brush on as well. I unbolted the calipers and hung on wire to paint.....