Heculiner is pretty good. I put it on my rockers, and the fender trim on my Rodeo. It has held up pretty well. Like said before it does fade quickly, and 2 coats aren't enough. A gallon is plenty for a Jeep. A buddy and myself split a gallon to do our trucks(a Rodeo & 1st gen 4Runner) He did his boulder bars and rear tailgate, I did a 12" rocker. We still had 1/4 of the gallon left. I should have used it all and put on the extra coats, but you get the idea.
I know having it done isn't cheap. Another buddy of mind paid an extra $425 to have his rockers done when they did the bed of his Tacoma. Another friend had his bumpers/boulder bars done and it was around $350.
1 gallon of Herculiner will easily get it done, and will give you enough to get the multiple coats you are after.
Steve