My non-RV has a powder-coated engine mount. Have to say that was a mistake. It discolored and softened under the heat. On my RV-3B project, I made a simple resolution: since so many of the steel parts came bare, I chose a non-powder-coat coating for them.
The few powder-coated parts got some rather careful consideration as to whether they had a chance of standing up.
I had the engine baffles powder-coated on that non-RV, too. Another mistake. It can't be cleaned, since the dirt gets embedded in the paint, and in a few places, the paint peels off.
Dave