ANSWERING QUESTIONS ABOUT OLD CANS OF SEA FOAM. Sea Foam was trademarked in 1942. Even today we receive phone calls about unopened cans that were produced at some point during the last 75 years. It’s all good! Because Sea Foam Motor Treatment, Sea Foam Spray, Hydra Trans Tune, and Deep Creep are derived from organic petroleum, none of their contents will degrade in a sealed container that is not exposed to the oxygen atmosphere. Two answers: No matter how old, Sea Foam does not have a shelf life if a container remains sealed. On containers that are opened and re-capped, Sea Foam will maintain much of its cleaning and lubricating qualities for several years though there are always variables to consider.  We at Sea Foam would not hesitate to use, anyway.  Exclude occasions where the history of the container is not known.