I was considering the heat gun method that Gary mentioned, but after researching it seemed that it works, although once the trim fades again from uv exposure, it will be worse than before.

My suggestion? Stop using those auto store branded trim restorers and get something that has some real uv protection for your trim. I clean mine well with Adams All Purpose cleaner and go over all trims with Adams Super VRT lotion about 4 times a year. It's waterproof, water based and the equivalent of SPF 30 for your trim. It will keep the new look you are after.

Rattle canning your lower trims will look ghetto in my opinion, they need to be sanded smooth properly, adhesion promoter applied, before primer paint and clear coat in order to be done properly.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards