Mercury Storage Seal Fogging Oil Mercury Storage Seal forms a protective barrier that prevents rust on internal metal surfaces. It also keeps cylinders lubricated to prevent cylinder or piston damage when starting your engine after storage. Directions Start engine. Securely insert a plastic tube in the spray head nozzle. Slowly spray Storage Seal directly into air intakes so it goes into the engine. After 15-20 seconds, spray heavily to stall engine. Remove spark plugs and spray for 5 seconds in