I have new tile going up in a new shower. The fellow has me very concerned. When I came home today he has set about 1/4 of the way up the wall. I thought the thin-set was supposed to be swiped all over the backer board like cake icing. He has put small gobs under each tile. I can see the backer board behind the tile and in the seams between the tiles. Help! I don't think this will hold my tile on the wall. Anyone ever seen it done this way? Do I fire the tile guy?? This ia an urgent matter. He'll be back in the morning