I had a buddy who did the cargo area of his FJ60 with a combination of Herculiner and the Duplicolor bed liner stuff. Base was Herc. but he found it a little too rough for crawling around on hands and knees so he topped with with a smoother coat of Duplicolor.

I did the bed of my VW pickup with the Duplicolor stuff, it has held up fairly well, the bed is covered though. One tip is to air it out well and as long as possible. Even though mine was in the bed, with the topper on, it was well over a week before I could open the rear sliding window to the covered bed and drive. The fumes were overpowering for that long. So don't plan on painting one night and go on a wheeling trip the next day without a gas mask!