Ever wonder what to do with the open tubes, cans, containers of caulk, sealer, and compounds? Don't throw them out-put the cap back on, or put masking tape over the opening. Then, light a candle and let the wax drip onto the cover, cap, or tape. When the cover, cap, or tape is covered with wax, and the contents in the tube, can, or container are sealed, the air cannot dry out the contents. Put it on the shelf. When needed, peel the wax off and the contents are fresh and ready to use.