I am going to try Monstaliner next time. They have a wide array of colors and they sell a liner without the rubber particles Herculiner has. It goes on with a better final texture: no nibbles. They also make the Chassis Saver product. You can request four color chips (for free) from their color selection to make sure the color you think you want is the color you will actually get. I was only interested in one color, but you have to request four. It turned out well. The color I thought I wanted had more purple in it than it appeared to have on the web site and the color next to it was closer to what i had in mind.
http://monstaliner.com/I won't be using the Herculiner product again. I put three coats of it on my rockers (four years ago) and they didn't hold up to the chipping/rusting at all. I think Herculiner does not have the UV resistance it needs to have. When I coated my brush guard with it about 18 months ago, I just dipped the liquid part and tried NOT to get too many rubber particles in the coating. I put three coats of Herculiner fluid on the brush guard. After it dried I sprayed three coats of Rustoleum semi-gloss black over it to keep the sun from degrading it. So far, so good.
Looking forward to seeing your finished sliders. My rockers will need attention/replacement by next spring (dammit!). I have some rectangular tubing on hand for it now, but I'm totally open to new/different ideas.