Has anyone had any success painting over bitumen? I have revived a roundnose project that was a bare metal respray 30 years ago. The floor pan underside has been painted with bitumen and then sprayed with acrylic. The acrylic has peeled back in a few location but OK in about 75% of the floor area. The floor is solid and rust free so I don't want to disturb the bitumen and because of the textured finish, I can't rub back the acrylic.
Any suggestions on what type of paint I could use to reseal the underfloor that will stick to both the acrylic and bitumen?
Thanks in advance.
Mozzie

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1970 Mk2
1968 Mk1 project

Hate to say it, but bitumen!
Black tar over the lot. Will help stop the acrylic from peling off.

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Too many cars, and too little time.

Maybe try spraying small area with acetone, might soften paint and allow adhesion.

The best finish I ever got was with Dulux sound deadener/ ripple finished in Dulux enamel, but they stopped making both in the '80s.
Acrylic paint doesn't stick to many surfaces except its own primer.
Enamel is much more adhesive - especially after 30 years of the bitumen drying out.

I had the same and washed it off with petrol. Slow process but worth it. Nothing will adhere properly and will never look original.