Makes sense to me.
Are you sure they said that about the grout? I have been advised to wait for 1 year before sealing my pavers as due to settling that may occur, some may have to be replaced during that time. If sealed prior, any new pavers will look very different than the sealed ones. I have not heard anything about warranty issues with sealing grout or granite countertops and plan to do that as soon as I close
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