The sealer should be reapplied at least every couple of years but preferably yearly.
Resealing granite benchtops.
Buff the granite completely dry and wait an hour for any moisture the stone has absorbed to evaporate.
Test whether the granite needs sealing.
By definition granite is an igneous rock with at least 20 quartz and up to 65 alkali feldspar by volume.
It is the potassium feldspar that gives many granites a distinctive pink color.
Instructions for sealing granite counter top the right way are by using recommended grani.
Clean the granite counter well before resealing.
Granite differs from granodiorite in that at least 35 of the feldspar in granite is alkali feldspar as opposed to plagioclase.
If you have granite benchtops that do require sealing you will need to re apply the sealer periodically in order to keep the granite in tip top condition.
Spray cleanser evenly onto the surface and buff the stone to remove surface debris grime finger oils or other substances that could block the sealer from penetrating the stone.
Granite benchtops are not as porous as the softer stones however they can still stain with constant exposure to oils and soaps and will also benefit from sealing.
You should seal your granite or marble countertops once every year.