Used these in shower floor. These are great once you get them, but after they are installed and sealed with a clear water sealant for natural stone, the stones brown undertones come out. Also has a dull white film look on it when dry. It could very well be the sealant that caused the change in color and white film, but it wont last without a sealant since its porous, so just know that if you have to water seal, it will change the look.