The trick to properly using a California Duster is to apply extremely light pressure and only use it to remove extremely light dust. Never rub or "scrub" the surface with it and it will not harm the paint.

Last year as SEMA we used them to constantly dust off the cars we were maintaining and even on the totally flawless black finish of a Dearborn Duece ($125,000 replica of a '32 Ford Roadster hot rod) it did not make a single mark. During the 3-1/2 days of the show this car and others were dusted off every hour (!) and it still looked freshly detailed. The lighting was extremely harsh at the show and ANY defect would stand out like a sore thumb.

Don't be afraid to use this, just use it intelligently.