> So I'd vote to either store the boat, unepoxied, on the strongback or coat
> both inside and outside and store it off the strongback.

Same advice. My first choice would be to leave it on the strongback and on the forms but do not epoxy either the inside or outside.

As long as the inside and outside are treated the same they will expand/contract roughly evenly and all will be well. If you epoxy one but not the other the will expand/contract at different rates and be way out of whack.

The reason I recommend leaving them on the forms is that even after epoxying both inside and outside of my hull and then letting it sit for weeks off the form it spread and was a pain to get back into the right width to match the deck.

You should, however, be OK to flip it over and plank the deck and then leave both the deck and hull un-epoxied and on the forms while you are gone. I put a strip of tape along the top of the hull before stripping the deck so that I could get them apart cleanly. When you get back epoxy the hull and deck outside, strip the hull off the forms, epoxy the hull inside, PUT SPACERS IN THE HULL TO KEEP IT THE EXACT WIDTH OF THE FORMS (I forgot to do this and it was a pain to correct), strip the deck off the forms, and finally epoxy the deck inside.

Just my two cents, you can probably have success other ways as well.