Sealers

Hello,
I work for a Stone (http://g603.net) importer and (http://maplered.com) need some more knowledge on sealers.
I usually tell our customers that it is well worth the money to buy a better sealer for their Counter (http://GialloFiorito.com) top. It will last longer and (http://maplered.com) more durable. I also tell them to make sure that the Granite (http://tanbrown.org) or Marble (http://www.lightemprador.com) is completely dry for at least 24 hrs before sealing so you don't seal moisture in the Stone (http://g603.net) . Am I giving them the right advice? I hope!
Thanks
Greg Rodriguez