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I use a product called "Plastic Weld" it can be purchased at auto parts stores like Autozone or Advanced Auto, Pep Boys. It costs about $5.00 for a couple of ounces. It is a 2 part adhesive. If you store it in the refrigerator it prolongs the shelf life. If not, once it is opened it goes bad after about 3 months. If you are repairing a crack, back up the crack with a scrap piece of ABS. I got mine from a business that makes signs -for free.
To shape the ABS, warmed it up in a toaster oven to about 140 degrees F, apply the warmed piece to the area to be repaired until cool, so it will take shape. Apply adhesive to patch, hold in place to damaged area for a few minutes and that's it. Cures in about 15 min. It can be sanded and painted as needed. It will glue almost anything. esp. skin