I applied polyester resin to the outside of the buoyancy tank, and when I came back the next day, two of the planks that make up the forefoot (if it were a boat) had sprung apart. Their forward ends snapped off when I tried to push them back into place.
So I left it for the winter and just got back to it. I used bondo and finger-clamped the two pieces back into place, then glued the snapped-off forward end bits back on. The job isn't as smooth as planned, but it's just a buoyancy tank, right?