Don't know about other brands but the Duplicolor Bedliner in black also fades or gets kind of grayish after awhile. I don't know how chip shield would do on running boards, its like the stuff they used on rockerpanels and door bottoms. I know they made some brands of this chipshield that could be mixed with the paint color you were using. The advantage of this was if it did get chipped the color was clear through the coating. They do make it where you can spray it on , then topcoat it, but if it gets chipped it shows. The only problem is it takes a special gun to shoot it. The gun looks about like the ones they sell with bedliner coatings.
