Mosaic Grouts and Sealer
Mapei Keracolor non-sanded grout is the best for glass mosaics. (Sanded grout will scratch the glass.) It is sold in many colors but black and white are by far the most popular! Sold in 1 pound bags.
Mix the grout sealer instead of some of the water if you want to avoid staining. Great for outside articles like coffee tables, etc. Sold in an 8 oz. bottle.