Thanks earthman, I finally got that info you asked for.
The stuff I use is called Fusor. It's a two part mixing system which does require a special application gun, and uses automixing tips. The same company also makes other epoxy based glues for plastic/fiberglass glueing and bumper repairs. Most automotive paint supply stores can get the Fusor products or 3M also has similar products. You may also be able to borrow or rent the application gun from them as well.
I used the Fusor 112B on this project. It has a 45 minute working time, and 24 hr full dry. To prep the two surfaces to be glued they must be ruffed up with a 36 grit grinding disc untill all paint and primer has been removed. Mate the two surfaces together and clamp or temperarily screw nail every six inches for best results. When done properly it is much stronger than welding.
Here are a couple pics of the system.