You can buy stone sealers at any stone supplier, home improvement store or online.
Read the instructions for details, but basically you wipe the sealer on and then wipe it off after a short amount of time.
For more information on sealing and cleaning your granite check out my Stone Care & Maintenance Guide.
|Photo: Surfaces Granite|
Don't let the fact that some stones need to be sealed deter you from having the beautiful countertops that you want!