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No wax, sealant, or other product intended for paint protection/beautification is going to protect your paint from stone chips and the like. The best bet for protection is some sort of clearbra like Xpel or Stoneguard. They seem to work pretty well but I have never purchased one myself.
Crystal Guard gave me a free do-it-yourself sample, but I never really prepared the surface on my test vehicle fully, so I didn't get the best results. I ought to try it again before making my final opinion on it. However, I can tell you that they seem to throw around the marketing fluff quite a bit.
With any product, they key is surface preparation and not necessarily the product used. New cars don't require that much prep and so they tend to get good results without any real work.
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