How to grout uneven glass tile?
I have installed glass "wavy" tiles around the walls of a bathtub/shower. Each wavy tile is about 2.5" long with a square piece of marble between each glass wave piece. They are arranged on a 12" square sheet of mesh in a basket weave pattern and each of the pieces are butted up next to each other (leaving no room for grout). The person at the tile store told me that I didn't need to grout it. However, given that it is in a bathtub that also used as a shower, I'm thinking it will need to be grouted so water doesn't get up under the tiles and loosen the tiles over time. Three questions: 1) Do you agree that I need to grout?; 2) How do I go about grouting this wavy tile (it is very uneven... the lowest part of the wave of each tile is 1/8" lower than the top of the wave); 3) As an alternate to grout, is there a clear product I can put on it that will seal up the spaces between the tiles without ruining the shiny finish of the glass?