As with anything, preparation is the key. Do a quickie prep job and you will have problems through the life of the mod. Put the time and effort into the sanding, taping and environment you spray in and your liner will last for years. I am partial to the UPOL Raptor. The kit it comes in is awesome and very simple to use. Just hook your compressor to the spray gun supplied and shoot. It is highly UV resistant. Ebay is your friend for finding deals on the kit. I got mine for $99 shipped. You can also add color tint to the UPOL so you can choose whatever color you want for the tub.
BadJeep Build: D60 front W/ARB and 5.38 gears, Sterling 10.5 rear W/ARB and 5.38, 3 Link front, 4 link rear, 14" ORI Struts, Atlas II transfer case, A to Z Fab full cage, Genright fenders, A to Z Fab front bumper, and Warn M8000 winch. Thinking stroker in the future.