Last year some of us reviewers were sent samples of epoxy from Newton Supply called Epo-grip. Since I've started using it I've thrown all the rest of my epoxy away. I love this stuff. It comes in a paste with the consitency of peanut butter. It's easier to work with than more traditional "runny" epoxies, it stays where you put it, and it's very strong. I highly recommend it.
I've been recommending this to my flying buddies and one finally caved in and got some. After his first use he called me up on the phone and the only thing he said was "You were right about this epoxy. It's great!!!"
http://epogrip.com/hobby/
Ken