They now make a filler just for rubber (plastic) bumpers. I used Evercoat Poly-flex for my car.
When repairing a rubber bumper is is imperative to clean, clean, clean all traces of dirt, silicone, or other contaminants before doing anything.

MGB Rubber Bumper (rear) removed from car and put on engine stand for cleaning

Cleaned rubber bumper, filled dings and dents with Poly-Flex

MGB Rubber Bumper, painted with flexible primer

MGB Rubber Bumper, painted with flexible primer (inside)
I violated the rules of purists by painting my bumpers to match the car. I love the looks of it this way, your mileage may vary.
If you want to paint the bumper using real auto paint, just add a flex additive to the paint.

Painted MGB Rubber Bumpers (color matched), front bumper

Painted MGB Rubber Bumpers (color matched), rear bumper
For primer, I used black rubber bumper paint from a rattle can and then painted the r'umpers and the car with a single stage urethane. No flex additive used. No cracking, flaking or discoloration for over 5 years now.
For primer, I used black rubber bumper paint from a rattle can and then painted the r'umpers and the car with a single stage urethane. No flex additive used. No cracking, flaking or discoloration for over 5 years now.
Two thumbs up for your work though. I'm glad you ignored the so-called purists and did it your own way. I love the boot luggage rack and it's given me an idea to make one with some teak or walnut slats inlaid.
I like that look!
I've been considering doing that to my RB Midget & was just trying to find some pics, when I ran across your article.
I like it!
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