This from Frugal's forums. theyeti1775 1lb Propane bottles - how long can they be stored? Just a quick question, was wondering how long the little 1lb propane bottle (used for cook stoves) could be stored for? Found myself at Wal-Mart last night and noticed they had an over abudance of them on the shelves. Answers : Dave The propane can never go bad, only the container. Keep them rust free . I'm using a bottle from 1994 in my shop today. All I orginally did was wipe it vasoline and kept the cap on. Jerry D Young I had one that was over twenty years old. Worked just fine. Warning reply against use of petroleum jelly etc. on threads of tanks. medicineman Not that I think anyone isn't smart.... But remember to NOT put any petroleum oil/grease/jelly into, on, or around the threads or the area of the valve. Oil + pressure = BOOM And that's your safety tip for the day. LOL Correction on use of petroleum jelly on tanks. Dave I'd sure like some reference on your end mediceman. I've been able to find half a dozen credible references for using Vaseline on tank fittings from Propane tanks but none against. It's always been common practice as far as I was originally taught when I built my first propane forge nearly 20 years ago. It still is according to my Propane delivery man when I asked yesterday. If something has changed over the last 20 years I'd really like to know for all the obvious reasons. Below is reference from a propane Co., in a California where lawsuits and over regulation is the rule of the day. Propane Sales and Service at Cal U-Rent... " DETECTING LEAKS: In its’ natural state, propane is an odorless gas. A foul smell has been added to it so that you can detect any leak. If you suspect a leak in any propane tank system (including lines and connections) put soapy water on the suspect area and see if it bubbles. A good idea to reduce chances of any leak at your line connection to the tank is to coat the threads with Vaseline prior to connection. Remember that the threading is reverse and you must go in a counter-clockwise direction when tightening the line to the tank. " end quotes. I hope this is useful to those who use propane.