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why use protective film. are you putting them on, off, on,,off
I put the Mopar factory fit mud guards on mine. You are correct about collecting water and crap in the open top design. I liked the fit and factory look so instead of getting rid of them I did a easy fix on them. I stuffed News paper in the holes leaving it about one inch from the top of the holes and then topped it off with black silicon rubber sealant. Just filled it using a caulking gun and a wooden pop sickle stick to smooth it out nice and flat along the top. Easy fix now they are sealed up and the black caulking looks like it came that way.A word of caution on the Mopar ones, they fill up with water, crap, gravel etc and will freeze solid. The drains in the bottom will not allow for drainage. I pitched mine, even though they are the best looking ones, and replaced them with Husky's.
The advice on protective film is dead on, The Mopar ones don't come with any and after less than two months mine were starting to wear into the clearcoat.