[JavaBrewer]

When you apply the 511 it needs to be buffed before it starts to dry otherwise it will leave a haze on the surface. If it does leave a haze then apply a bit more using a rag and buff clean. It's an excellent sealant for stone products. If you want to deepen the colors of your floor there are enhancing sealers for that as already mentioned. Yes good idea to start in the corner of someplace discrete.