Whenever you are using epoxy for assembling large sections of a model, like joining the horizontal tail to the fuselage, put some low tack masking tape on each side of the joint. Wipe up the epoxy that squeezes out with denatured alcohol. If any more leaks out, it will end up on the tape. When you remove the tape, the original surface will be blemish free.
Henry and Thatcher Greene, Anguin, California