I use Parks Epoxy and Lacquer Thinner. I got it at the local True Value Hdwe. As far as effecting the bond , I haven't noticed any difference in the bond but it takes longer to set. The thinner you get it, the longer it takes to get cured out.
Look into the epoxies used for fishing rod-building. Some of them are extremely thinset. Also (just a thought) look into the Loctite CA adhesives that claim toughness and no-whiteness or clouding when they set. I think Loctite 411 is the number I use at work. I bought a huge bottle and it has served me well.