OP, your problem here is that you do not know the type of paint used. We have a painted driveway (Sherwin Williams xylene based) and the original installer has stopped resealing these due to problems with the sealers getting cloudy. So while I agree with the previous comment, you need to test an inconspicuous area. Also, very important, add shark grip or equal friction additive or you may end up with a very slippery surface when you are done.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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