I machine a lot of ABS at work and sometimes that requires glueing multiple pieces to get the thickness I need because they don't make the raw stock thicker than 4 inches. The best ABS cement I've found is made by Marsh Laboratories in Pittsburgh PA 412-271-3060. It's really inexpensive and is sold in 1 pint cans. Their stuff is a commercial version of Scott's mix, it's just ABS resin and Methylethyl Ketone.