Fiberglassing the box in the hot sun. I like to use about 10x more hardener than needed! dries alot faster.Spreading body filler over the box and cheese grading it is a pain in the ass. Had lots of help from my girlfriend though, so I had more fun than usual.Me, Sanding at 2am, gettin the box ready and prepped for paint in the morning. The finished box, Finally I finished, looks great.