Traditional epoxy tile grouts can quickly stick to the tile face, and as a result, many tilers clean them off too early to prevent this from happening, which often results in some of the soft grout mortar coming out of the joints. Alternatively, ARDEX EG 18 PLUS Epoxide Tile Grout can be left on the tile surface for up to 60 minutes, allowing the grout to harden adequately, and can still be cleaned off with a normal sponge! For best results, use a fine mist spray to soften the residues first.