All the makers seem to say that a gallon is enough to do a short bed and that a gallon and a quart will do a long bed. I'm still debating where to stop mine. Hubby wants me to wrap it up the sides and do the top of the bed rails instead of putting bed caps on it but I'm more inclined to only bring it up to the very top edge and go with the caps. Not sure how clean an edge I can get with tape but I'm also a little concerned that the extra thickness might effect the way the caps fit down on the rails.
Yep, buying a gun just to do one truck doesn't sound very cost efficient. lol Besides that this thing is a crew cab with a fresh paint job on the outside so...let's be honest...I'm too doggone lazy to mask off the whole truck just to spray a bedliner! I'd like to be able to brush or roll on anything, primer included, that I have to put on it just to avoid all that masking.