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Granite Gold Sealer creates a barrier to protect all natural stone. The water-based formula maintains maximum surface protection against staining, etching and soil build-up. Frequent use maintains maximum surface protection, penetrating stone surfaces to provide superior, long-lasting resistance to staining, etching and soil build-up. Regularly check the integrity of the seal with an at-home water test. Pour water (about 3 Inch in diameter) on the surface in several locations and let it sit for 30 minutes. If you see a dark mark or ring, the water is penetrating the stone and it s time to reseal.