I first repainted my endura bumper in 1972, and I recall there being some
overspray on the metal framework, but I've slept since then so perhaps I am mistaken. If you are satisfied from your research that there shouldn't be overspray
then go ahead and mask it off. I doubt anybody has an original unrefinished endura bumper to look at since the paint failed immediately on all of them, so
I think it is a matter of conjecture.
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