Sealing Granite and the Water Test
Put a few drops of water on the granite countertop near the sink and watch them for ten minutes, the simplest check the breakdown sitting on riverside granite countertops petridishnews lists for deciding when to seal. Granite in Riverside, CA kitchens varies in porosity, and some slabs barely need sealing while others soak up water and oil quickly.
What sealer does
A penetrating sealer soaks into the pores of the stone and slows absorption. It does not form a coating on top, so the surface looks the same. It buys time to wipe up a spill before it stains, rather than making the stone stain proof.
Reading the water test
If the drops bead up and leave no dark spot after several minutes, the sealer is working. If the stone darkens under the water within a few minutes, the granite is absorbing and needs sealing. Testing in a few spots, including near the cooktop and sink, shows where the sealer has worn first.
How often
Dense dark granites may go years without needing it. Light, porous granites may need it once or twice a year. Heavy use and harsh cleaners wear sealer faster.
Applying sealer
The counter is cleaned and allowed to dry fully. Sealer is applied evenly, left to soak for the time the maker gives, and the excess is wiped off before it dries. Leftover sealer on the surface leaves a hazy film.
Stains that got in
Oil stains on granite can sometimes be drawn out with a poultice, a paste that pulls the stain back out of the stone as it dries. Dry Santa Ana wind days speed drying, so poultices are covered with plastic to work slowly.
Seams, edges and cutouts
Seams and cutout edges soak up more than the flat surface, because fabrication exposes fresh stone and the seam epoxy sits slightly lower. Sealer is worked into those lines with a brush or a folded cloth, then wiped dry. A sink cutout cut by waterjet or bridge saw may have rougher edges that take more sealer than the face.
Dry climate and sealing
Riverside is dry for most of the year, and a countertop dries out faster than it would in a humid city. That helps the sealer cure, but a counter near a window in direct summer sun can bake sealer thin on the surface.