just stick a hole in each rear leg at a bit of an angle
so that later you can re-slide a long toothpick or a bamboo skewer into there to counterbalance the weight and pull of the balloon
i'd poke the bottom of the leg and twist it up in there
you can remove it while it dries then reapply it to assemble it
so long as you have the hole there to counter balance you'll be able to float the balloon
or you can dry it with the skewers stuck into foam too
do this in stages








