20" x 20" 3-Pack Waterproof Mosaic Backer

These large, 1/2" thick square mosaic backers are perfect for creating a mosaic tabletop - indoor or outdoor. You can also use it for a wall hanging. Size: 20" x 20" - 1/2" thick - 3 each Treatment options for edges: - you can tile the 1/2" thick edge - you can paint the edges and back with paints that do not contain solvents of any kind as they will warp the board. Use latex or acrylic paints. - you can thinset the edges - you can grout the edges