I installed granite tiles on my bathroom vanity (pics to follow). Anyway before I sealed it water would leave spots on the granite. I applied 2 coats of sealant, per the instructions but I still get spots. The spots don't form as quickly as before the sealer by the still form. Am I misinformed that the sealant should stop the spotting? Or is it doing what its supposed to do and slowing the process. Should I apply more sealant? I do have some leftover.