When I'm done grouting, I wipe down with vinegar, and my mosaic looks so clean and shiny and good! But that only lasts a short time. Is there a way to permanently make your work look that clean and shiny?
I like glossy grout too, and use Tile Lab glossy sealer. It is for interior work only, though. I'm sure there's an exterior sealer. I used it on a birdbath, and it turns white outside, so I scrubbed it off. You can find it at Home Depot - gives a very nice finish w/two coats.