This innovative mosaic tile backer simplifies installation and improves handling of individual mosaic sheets by providing a rigid support structure. It also allows you to adjust the thickness of your mosaic tiles for a consistent finish when used alongside thicker tiles. Compatible with standard mosaic tiles only, not suitable for self-adhesive types. This mosaic backer turns individual mosaic sheets into a more rigid form, making them easier to handle and install. This handy backer can also be used to pack out the thickness of a mosaic tile to match a thicker accompanying tile. To be used in conjunction with standard mosaic tiles, not self-adhesive tiles.