These mosaic backer sheets are designed to fix behind mosaic tiles to increase the stability of the mosaic and make it easier to install. The sheets hold all of the individual pieces of tile in place to insure even grout joints. The backer sheets also increase the overall thickness of the mosaic tile, so that the mosaics sit level with other tiles. Adhesive 5100 DESCRIPTION A vinyl compatible, acrylic-based, floor covering adhesive specially formulated to install vinyl composition tiles, solid vinyl tile, all types of carpet tile and approved under cushion pad in a double glue down application. Can be brush, roller, spray or trowel applied. SimpleMat is a double sided, adhesive sheet that is perfect for attaching tile to a countertop or backsplash. It can be used on drywall, plywood, plastic laminate, or painted surfaces. This one-step, non-sag, polymer fortified adhesive mortar is formulated to use in glass tile application. It offers consistent ultra white color with optimal bond strength across the surface area.