I have put some 3M protective clear vinyl tape film (after touching up). Just this past winter, I noticed that there was some rust coming at the door sills trim where sand, etc. gets underneath and rubs over time. It wasn't too bad, but wanted to nip it in the bud now.
Spent a good part of the day removing trims, little bit of rust, touch up painting and once paint was dry, put the protective film enough to cover past the door sill trim and past the painted edge to protect the paint. Kinda wish I knew about this and would have put the protective film earlier on and then not have paint to touch up. Ah well, live an learn.
Link to another post (mine was not near as bad though):
Door Sill Rust
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2016 Limited - Blizzard Pearl