I’ve never seen naptha (i.e. Zippo lighter fluid) do anything to any painted or finished surface, nor any of the plastics I’ve ever tired it on.

I’d guess that it’s probably bad news for natural rubber. IIRC, naptha is similar to gasoline, and gasoline will mess natural rubber up.

That being said, I have a can of naptha myself.

kagis

en.wikipedia.org/wiki/Natural_rubber

The two main solvents for rubber are turpentine and naphtha (petroleum). Because rubber does not dissolve easily, the material is finely divided by shredding prior to its immersion.

One other thing to keep in mind is that it is (obviously, given that that’s how lighters that use it work) quite flammable in vapor form and the fumes aren’t great to breathe, so this is something you’d want to use in a well-ventillated area.