welding wires quite good but tbh the best stuff to use i would say is cheese wire. Its a wire that windscrean companys use to cut out windows that are bonded on. what you wanna do in the future is pop down your local rac windows ect and ask if you can have about a 2 foot peice. Rap it around a bit wood, pair of pliers ect at either end and saw at the bonder. Where strong gloves know as it will cut into your hands and be careful not to damage the tailgate paint or the spoiler its self. Hope that helps