Proseal is an ultra premium grade impregnating stone sealer for a wide variety of materials. Compatible materials include: * Granite * Marble * Quartzite * Engineered Stone * Limestone * Onyx * Concrete * Sandstone * Slate * Terrazzo * Travertine * Quartz This impregnating sealer is rated by fabricators as one of the best stone sealers to be used on natural stone such as granite and marble. Period. No other sealer will penetrate and protect as well as Proseal. What about the 15 year sealers? Or sealers that come with a warranty? Are they better than Proseal? On the surface , it might seem that way. But the reality is that they do not!