I'm going to chime in with using Acetone to thin the epoxy. Acetone is specifically identified as being a thinner for epoxy, it doesn't change the cure time like heat does, and it acts as a carrier to pull the epoxy into the wood fibers. It evaporates away, so it doesn't leave the epoxy gummy or porous like alcohol can. Just use it in a well ventilated space. Mix it about 25% acetone 75% epoxy, and you can apply it with a brush, a small rag, or even a gloved hand. Pour it into hard to reach places and roll the fuselage around and it will seal joints and seams.

Brad