Fix cracks and scratches with nail polish Nail polish can do many, many things, and its clear variety is no less an amazing solve-all. Need to slow a crack in a windscreen or window before you can get it repaired? Nail polish has you covered. Got a little ding you want to prevent from rusting? Clear nail polish does the trick. Better still, if you can find a nail polish shade that (closely) matches your car's paint job, it can work as less-expensive touch-up paint, since the two paints are eerily close in nature.
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