What is the medical term for the fetish of slowly peeling protective film off of new products?

There isn’t one. The world is full of things for which we have not invented words.

It depends on what the new products themselves are.

I can imagine a fetish of peeling protective film off certain things, but not just anything.

Peelophilia

I think it’s just a sub-category of the unboxing fetish.

ecdysiaphilia

related to the word ecdysiast, which means striptease performer

Tegadermaphilia. It comes from the correct way to remove a tegaderm wound dressing: pull it back over itself, parallel to the surface – not vertically.

Fetishes aren’t medical conditions.