If its the same type of rubber as the standard one its not ment to be painted.
Paint shops/ body shops use a special plastic primer 1st to prevent the paint
from cracking.
You will have to remove all old paint and start again to do it properly, this will be a nightmare.
Try a jet wash 1st to try and bring the paint off or if you know anyone who works in a body repair shop get them to try with compressed air.
If not you will have to sand it off.
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