I never really planned on building one, but the other day I was at home depot and they had bathroom vanity cabinets on sale for $7.50 16x18. Not a great size, but you can't beat the price, so I bought some 1/2 inch foam board to insulate with. Is there any preference of tape, caulk, or sealant I should use for those corner spots where the joints come together. I was going to use plain ole duct tape, but thought I'd consult the great oracle first. I'll end up with two layers of 1/2 inch,which should leave me room for a 6 gal carboy and some room for ice or heating pad, depending on the season. Any general advise is welcome.