I bought Ultima tire and trim guard plus for my plastic trim and tonneau cover. So far its AMAZING. It has rained twice and there is absolutely no run off. It actually beads the water off like a wax. The best part is its a thin liquid and a little goes a LONG way!!! Just my 2 cents!!
http://www.autogeekmobile.net/ultima-tire-trim-guard.html

 

Sound good... Have any Pictures???

 

I will try to post some some tomorrow. I took one with half the cowl done. I have tried all kinds of trim dressings and they all washed off with rain. This one is just plain awesome!!!

 

I finally got around to getting a pic. A few weeks later and it's still going strong! Absolutely no run off.

 

Looks good!