Give "Marine Goop" a try. Easy to work with, cures clean, stands up very well to the weather.
Tom Trigg
I intend to us rocks or pebbles to make a stone wall and to give it that "thrown together" look.
Modeling the Bellefonte Central Railroad
Fan of the PRR
Garden Railway Enthusiast
Check out my Youtube Channel:
http://www.youtube.com/user/PennsyModeler
It'd depend on exactly what you intend as to the use of epoxy or grout/mortar . Keep in mind epoxy will give the rock a wet look on the surface. Most epoxies will work ok.
GaryR
What kind of glue/exopy would you use to bond rocks together and is suitable for outdoor use. Thanks for the help. - Peter
Get the Garden Railways newsletter delivered to your inbox twice a month