I plan to use silicone fluid so was not concerned about the paint removal problem. Although powder coat finishes are harder and more durable, they are also easily removed with regular paint strippers, so I wouldn't assume they are impervious to brake fluids. Also powder paints come in several types: epoxy, polyester and silicone. Polyesters are better for UV resistance, epoxy better for chemical resistance and silicone better for high temperatures. I'm using epoxy powder with silicone fluid so don't expect a problem. But I'd test first if I was using a regular fluid.