How to Add Sparkle to Quartz Floor Tiles with Mapei Glitter Epoxy . Mar 16, 2016 . Craig Philips shares his top tips to grout quartz stone floor tiles using epoxy glitter grout from Tile Mountain. If you like your bathroom or kitchen tiles with a little bit of sparkle and shine, here's how you can use glitter grout for a fantastic reflective effect. This works equally as well using glass or metallic tiles for..