How To Seal A Granite Countertop
Although granite is very hard and naturally made up of very hard minerals (quartz and feldspars), it is porous and therefore needs to be sealed from staining agents that may invade those pores and stain the granite. If it takes a while, you should be okay, but keep in mind how long it takes to absorb, is how long a potential staining agent will take to absorb. Usually one coat is enough, but if your granite is very porous you can repeat the process after about an hour.
If you’re sealing granite that’s in an exterior environment, it most likely will only last 6 months due to so much sun exposure.
Wash the countertop with a mild dishwashing liquid and warm water to make sure it’s clear of loose particles and residue. Cover your sink and other surfaces not intended to be treated with plastic wrap to avoid getting sealer on them. An easy way to see if sealing granite countertops is needed put a few drops of water on the surface and see how long it takes to absorb into the stone.
Clean your granite countertops thoroughly with a neutral cleaner or if it’s badly soiled, you can use an akaline stone cleaner to break down dirt and grease build-up.
The last factor mentioned is probably really going to determine how long your sealer will protect your granite surface.
Also, if you bought the cheapest sealer you could find at the local hardware store, it probably won’t even last more than a month.
Although granite is very hard and naturally made up of very hard minerals (quartz and feldspars), it is porous and therefore needs to be sealed from staining agents that may invade those pores and stain the granite. If it takes a while, you should be okay, but...Administrator Stone Restoration Blog