I bought a new batch of beige granite countertops and they look great, have a good shine, but they are retaining moisture easily after sealing 3-4 times. I use Aquamix Gold on all my other granite but doesn't seem to be doing the job here. I am thinking since it is breathable that it is letting the water seep in and I am guessing my granite is pretty porous. Does anyone have suggestions?
If you look at polished granite with a magnifying glass, you'll see the tiny fissure and pock marks that allow moisture from water and other liquids to penetrate into it. Just because it's polished doesn't make it waterproof. One of my customers recently had picked out 3 prefabricated granite slabs but had to leave them in the granite yard for two weeks before I could pick them up. When I bought them, the slabs had darker edges and I was assured from the granite personnel that the darkness came from being exposed to the rain and that it would evaporate. We went through a hot spell and by the time I picked up the slabs, the moisture had evaporated and the darkness from the moisture was gone. Don't seal your granite until you are sure the existing moisture has evaporated because it's kind of like painting over a dirty wall, sooner or later the coating will fail. I don't buy my sealer from the big box stores. Go to a reputable tile or granite yard and get the best sealer you can afford and follow the application instructions. Personally, I use a product called "Rock Steel" and have had nothing but success with it.
If it's porous, it's not granite. It may be marble or some other stone, but granite is too dense to take on any appreciable water. That's why it's used extensively for curbs and sidewalks in Vermont, where winter weather is REALLY COLD - if it took on moisture, that moisture would freeze and blow our curbs & sidewalks apart (a technique actually applied in certain quarries, where ice in drilled holes eliminates the need for explosives).