I have sprayed a few things on my Wk both interior and exterior with plast-dip and it has all held up nicely so far. The exterior has held up no problems for about a year now. I would just go with plasti-dip to bring the side trim back to life.
2010 JKU - Stock for now
2005 WK - 6" lift, 35" BFG's, a lot more (SOLD)