Haul the boat, clean up the bottom and check for osmotic blisters. If any are
present the hull will need to be completely dried. The year you are overseas
would be an ideal period for the hull to dry, Upon your return you could make
the blister repairs immediately thus saving a long wait after your return.

Seek professional advice before attempting any blister repair.

If there are no blisters you will not have wasted any time nor effort as you
will have to haul the boat at some point in order to inspect it and to apply
antifoulant.

Good luck.

Butch