If there is a breach in the container, propane will leak out under pressure. For practical purposes, sealing the leak (e.g. with some form of sticker) is not possible. Leaks from the area where the propane is liquid (i.e. at the bottom) involve the loss of five times as much energy as leaks from the gaseous area. Leaking canisters should therefore be stood or laid such that the leak is now positioned in the upper section (i.e. where the propane is gaseous).