The most common here now is called Mineral Turpentine, the usual thinner/cleanup for oil paints, but I have found White Spririts. They both have the same smell, Turps being somewhat stronger and as mentioned, slightly less oily. I guess, the Turps being faster evaporating because of being less oily, it would be best to use with Rustoleum as a thinner, if needed.White Spirits is a UK name for Mineral Spirits. I thought in Austrailia and New Zeland they called it Mineral Turpentine. Anyway all the same thing, basically heavy paint thinner.
Turpentine is distilled from the sap of gummy trees.