“Parts that absolutely need PPF?”
Ditto the “none”, above.
Here’s my 30 year old black MR2.
I’ve driven it summer, winter, spring, and fall.
I’ve done that up here in Canada, where winter means ice, snow, sleet, and salty roads.
Hell, we even get some of that in spring and fall.
Sometimes also, God forbid, I’ve even hazarded driving it on gravel roads!
Despite all that and no PPF or anything like that, almost every time I take the old girl out for a drive at least one person tells me it looks great.
People who know dickshit about cars wave and smile; “nice car” they’ll say to me if I’m stopped, and other things like that.
And yeah, up close I see swirls, little scratches, and all kinds of paint-flaw and damage shit despite all my desperate, obsessive spurts of OCD during which I do my best to hide, polish, and touch up all the flaws that only I actually really see.
So I understand and don’t question why anyone wants to PPF their car.
But to be honest, I think we as owners are the only people who look so closely at our beloved vehicles to see them.
So, again, to answer the question, “no”, there aren’t any parts that absolutely need PPF, none at all.