I did Herculiner and and very happy with it.
Its took 3 days. Gutting the inside, prepping and cleaning and got first coat on. let sit until next morning added second coat. let sit again and then re assembled the third day.
If i was thinking ahead i would have painted the out side edges (getting rattle can paint job) before lining. I like the look of the edges that the roller left. sanding the edges to paint now. I think i will need to touch of the edges with a small can of liner.
I found the using wire wheels to scuff of the paint makes the process a lot faster.
Stuff ear plugs in the holes you don't want filled/coated..i did not do this and have a few drip spots on the ground below.
I would also get a can of the spray on liner to get the places the brush/roller cant get to.
1991 YJ, 4.0, 6" lift, 40" tires, full cage, dana44/ford 9, detroit locker, 5.38 gear