robinr767 - if you're mixing more than about about a tablespoon, you have to mix it in a shallow container. If it's in a tall container, it will heat up and set way too fast.

Also, Tower (I think) mis-labeled some 5 minute epoxy as 30 minute epoxy which might be what happened to you. They are recalling it so you might give them a call. It might be Great Planes instead of Tower though. I'm not sure, but I read something about it here at RCU just yesterday.