Has anyone found a way to make a hollow vessel suitable to hold water, besides buying glass inserts? I was thinking about trying polyester casting resin, pour it in and keep the form moving to spread it out until it is set-up enough to stay on its own, my only concern is if the wood moves how bad is it gonna blowup, or will the resin have enough give if kept to say 1/8 to 1/4 inch to move with the wood. anythoughts or has anyone tried it before i attempt?