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Im guessing if its actually chalk in them (not the paint pens they use on used car windscreens) then it might be risky on paint. Why not treat the area with some wax first of all for a little bit protection then try? Or someone elses car first!!
The car getting what you told me done to it at the moment?
Car gets waxed up to the max ne way but i dont wana risk it either way if it aint safe then i wont do it just wanting some input from ne one whos used them before.
UNI poscas are Water based so they will wash off with ease
any residual marks will polish out, wouldnt leave it for more than a day or two though...if you wanted to , just wash off and re-apply again