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I seal everything at the install. Yes, that stone does not take in much but I like to be sure. Sealer will not damage your stone but build up and cause a hazy look if applied too often. One application is a safe insurance policy and will most likely not need to be re-applied for 10 years unless you use harsh cleaners. Stay away from cleaners with sealer in them. Use a pure cleaner like Lustro Italliano and your galaxy will look great all the time.