-
West Systems 105 epoxy + 206 hardener + 404 high density filler. I've read other people getting good results, has good instructions for various metals and uses, and it's quite available in non-industrial quantities. I think there are stronger out there, but it should be all that is needed. I've just got to get the insides of the metalwork super clean.
There is a good right-up by someone building a near identical bike here:
http://noviceframebuilder.co.uk/projects/past-projects/953-carbon-semi-lugged-road-bike.
Glad I found it as it had some tips I would have learned the hard way otherwise.
Qual. What epoxy are you using?