Pitted roof from rust under vinyl top repair

Vinyl tops became popular to give that "sort convertible top" look, make more $$$, and IF the car manu. did not prime/paint the roof, well that is NOT good! Especially a few decades later after it has sat outside for years.
Yup!

Sometimes cheaper to just to put vinyl over steel to hide imperfections.

Look at the Challenger SE models with the opera window insert and of course , the Superbird!