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If the current countertop is not suitable to be covered in tile, install a cement backer board on top of the existing countertop. Drop a chalk line onto the cement backer board to find the center. It's a good idea to wear rubber gloves when working with adhesive.
Apply adhesive directly to the back of the 4" tile square with a notched trowel (Image 1). Place the tile in the center of the cement backer board and work outward. Add adhesive to the cement backer board with a notched trowel (Image 2) and continue tiling. Because it is a mosaic, there is no set pattern. The tiles can fit together in any form or color.
Use spacers to separate the larger tiles. Spacers come in many sizes, depending on the grout line desired. Let dry overnight.