Saniten PR90 grouting tile protector is designed to prevent grout from sticking to tiles, making clean-up easier after grouting. Ideal for ceramic, porcelain, luxury vinyl tiles (LVT), glass tiles (matte or polished) and metal inserts or tiles, this product dries quickly and is 100% water-soluble. Environmentally-friendly, Saniten PR90 grouting tile protector is biodegradable and VOC-free.