of glue on each piece, just enough to hold the piece in place. once you have finished gluing all your pieces in place, prepare your grout mixture as instructed on the package. if you are using ready mixed grout, add a little water (a few drops at a time) to make spreading the grout easier.
once your pieces are secure and no longer move (this takes less than an hour), spread your grout over the entire top of the glass and gently press the grout into all the seams, making sure there are no air pockets below the grout.
allow tray to sit for about 10 minutes, do not wait longer or 