3M Flexible Bumper Patch Kit, 05888, Black, 4 in x 8 in Description
This product will help fix the back side of bumpers. You do not need to sand it. The adhesive is fast and there is no wait time before you can work on the front side of the bumper. It is good for many plastics that need reinforcing, too. This product has six patches and six packets of adhesion promoter.