The same thing happened to me, except I pulled into my driveway a little too fast to park behind my 4Runner, though admittedly yours is worse. I used fiberglass mesh and resin mounted from the back followed by Bondo on the front. You don't have to be too picky with the touchup paint as long as you don't put it on so heavy that it sags. Two light coats is better than one heavy one. As for the top coat, mask it off from the lip of the bumper. Start your spray on the masking tape and spray it from top to bottom. Keep spraying until you are spraying the air beneath the bumper. Otherwise you get an aerosol edge that isn't as shiny as the rest.