There is no water in WD-40.
WD-40's main ingredients as supplied in aerosol cans, according to U.S. Material Safety Data Sheet information, are:
- 50% "aliphatic hydrocarbons". ...
- <25% petroleum base oil. ...
- 12–18% low vapor pressure aliphatic hydrocarbon. ...
- 2–3% carbon dioxide. ...
- <10% inert ingredients.
