- Grind it off and/or order a set of new backing plates and start over with ceramic caliper paint.
- top coat [just the inside] with the silver por "20" which I have on hand for heater boxes.
- top with the black ceramic caliper paint which I also have on hand.
- Put a second coat of black por 15, because the idea was to prevent rust. v How do you think por 15 will behave on the back plates if a wheel cyl sticks open and the drum overheats? will it melt and grab? flake off into a fine dust blending in with the brake dust? Who has painted the inside of their backing plates and what horrors have you seen and/or imagined?
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