Step 4: Apply Strengthener
With a plastic bumper repair kit, this will be a wire mesh that is “welded” into the plastic of the underside of the bumper and gives strength to the repair. With a Bond-O type kit, this will be an adhesive wire, fiberglass or plastic mesh. If you are using the kit, you will need to use the soldering iron type tool to heat the wire mesh and plastic to embed the mesh in the plastic. The Bond-O kit will have the mesh applied to the surface.