Seal King’s Natural Stone Sealer is a clear premium penetrating sealer specially formulated to protect, and enhance the color of flagstone and natural stone surfaces. This sealer will protect against mildew, fungus, UV rays, oils, acid rain, salt, and efflorescence. It will also reduce chipping, cracking due to freeze/thaw cycles. Also, this product allows moisture vapor transmission. DO NOT USE ON BANAS STONE.