Mt two pennorth, WD 40 used to branded Rocket 40 as NASA used it on spacecraft. I used it a lot back in the day as it was the spray can of choice in the Royal Navy workshops. Interestingly (or not) I've heard it can be useful for relieving arthritis in your hands as sufferers who cleaned their greasy mitts with it found it alleviated their symptoms. Have to say I do like the waft of it coming off a hot engine, solvol does the same, mmmmm! solvol! Stuart