ok, i hope this helps... i just got done doing the inside of my tracker last week. look around and check prices. i found the roll on kit of herkliner at Manards for $68 w/ a $20 rebate! it included a "sand pad" which was a green scratch pad.

lame. so i removed the carpet, center console, seats and front heater vents that run under the carpet to the rear. i then got out the 60 grit and worked it over real good. whipe it down real good, use a $3 can of spray air to get the corners. then wipe it real good with some wax remover, let it dry tape every thing off with 3" wide tape. then roll it, and if your ganna do other areas have them ready to go and do the inside first and dont use over 1/2 the gallon. oh, and decide how your are going to handle the inside door jams, and maybe remove the moulding around the bottom. anyway, then wait about 8 hrs and do it again. wait about 2 hrs and remove the tape while the liner is still flexable. the fumes are BAD. but it the forcast will give you 3 days with no rain and you will be fine.
i love how mine looks, but, remember the stuff IS tough, and rough. like i said i hope that helps. ps. the spray (in a can) stuff is alot smoother, thinner and doent hold very well and at about $8 a can, the gallon of roller is much better deal. it would take about 6 or 10 cans to get the same thickness. i know i used it too.