The look and feel of granite appeals to many homeowners, and it has become a relatively common material for countertops in the kitchen and bathroom. With proper care, granite countertops can last for decades--sometimes longer. Depending on the type of granite you purchase and the colour of the stone, its shine may become dull over time. You can, however, treat your dull granite countertops to restore them to their original shine.
Clean the granite well with a cleaner that is specially formulated for use on stone. Standard household cleaners often contain chemicals that can strip your granite sealant and leave your countertops looking dull.
Wipe down the countertops with acetone. Acetone is safe to use on granite and is very effective at breaking down any waxy build-up that has accumulated on your granite countertops--especially soap scum.
Seal the countertops, if you have not done so already. Sealing protects the stone from liquids and acids that could discolour it.
Rent a stone polisher or grinder and use high-grit sandpaper to polish your dull granite countertops. You will need to go over the countertops several times with high-grit sandpaper, increasing the grit as you go. The Weather Channel’s home expert, Danny Lipford, recommends starting with 50-grit sandpaper and working your way up to 3000. You may, however, start at a much higher grit for countertops that have been previously polished.
Apply wax or lacquer to your dull countertops. This will enhance the shine and protect the countertop from materials that could dull the stone. Re-apply the wax or lacquer when your countertop begins to lose its sheen.
If you opt to repolish your countertops, do not forget to reseal them as well. Not all types of granite need to be sealed.