i am doing a revamp of our bathroom,the old tiles are basic 6x6 white tiles,and are really well fixed to the wall,and i intend tiling over them. its very difficult to get them off,i did try but its not easy and i dont want to damage the bath trying to remove them,can someone recommend the right tile adhesive,local diy shop says any waterproof,but i am not convinced,i intend to scrub the tiles down with sugar soap to clean properly before tiling. What is the best adhesive to use,many years back in another house i tiled over tiles in a small kitchen with no problem,using basic tile adhesive. there are so any different adhesive about now its confusing. Should i coat the exisitng tiles with a bond before,again what do i use. Any advice appreciated on what to use. Thanks.