ROFF RAINBOW TILE MATE EPOXY GROUT IS A WATERPROOF, CRACK-FREE, STAIN-FREE EPOXY TILE JOINT FILLER. THIS LOW VOC EPOXY TILE JOINT FILLER CAN BE USED TO FILL GROUT BETWEEN CERAMIC, PORCELAIN, VITRIFIED TILES, NATURAL STONES, GLASS MOSAICS, AND OTHER SURFACES.