Sure plastic epoxy let it dry sand. a little light sanding and cover it with small amount of filler again sand. Get some spray touch up paint from a good paint dealer base coat clear coat mask off and blend buff and polish. Should look as good as new probably cost you about $150 in paint and supplies.
If the bumper is fiberglass then fiber glass matting and epoxy. Easy to work with and cheap you can but that stuff at Walmart.
PowerBlock Magazine has many tutorials.