I regrouted a ceramic tile shower stall, 4″ x 4″ tiles, using a non-sanded grout made by Custom Building Products. Joint size was about 1/8″ – 3/16″. Problem is the grout never got hard. I can chip it out with my fingernail. I mist cured for 3 days per instructions. Could I have gotten a bad batch, does this material have a shelf life ?
Robert