QUOTE: Originally posted by jhugart FYI, I haven't tried this, but I work at 3M. In our employee store, there's a new product, a spray adhesive (78?) that is designed for use with the foam we love to use in model railroading. If anyone tries it, please let me know.

I've tried using 3M 77 and 90 spray mount adhesive, as well as the DAP equivalent. My word of advice as someone who laid most of a mainline using the stuff:

DO NOT USE SPRAY MOUNT ADHESIVE FOR LAYING TRACK!!!!!

Spray mount is a low-tack spray-on rubber cement-like adhesive, used for mounting pictures (hence it's name). It will fail on you within a year. It also goes on bubbly, giving you an uneven tracklaying surface. ALSO, the bubbles generally don't go away, making ballasting and the overally appearance of your track look really bad.

If you work for 3M, try getting your hands on some of the double-sided tape used in the aircraft industry for laminating aircraft skin to the frames. The stuff is PERMANENT, but expensive.