Bostik Bosti-Set Thin Panel Adhesive 4 gal Bosti-Set is a non-sag, easy to trowel, specifically formulated adhesive for thin (gauged) porcelain tile panels. This adhesive has a rapid set feature in which you can install tile and re position the tiles for up to 30 minutes with no slip or sag. With this revolutionary adhesive it is only needed to be applied to the back of the tile, which saves time for the install, compared to the conventional application of thin-setting the wall as well as the tile. Features Cuts installation time in half Adheres to a wide range of substrates without primer Less waste than mortar Easy panel; replacement Easy clean up, even after the adhesive has cured Adjustable for up to 30 minutes with no slip or sag 80% less weight than mortar to stage Pre-mixed, no need for water or mixing at the job site Longer working time compared to other conventional thin-sets Trowel adhesive to tile only, no combing onto walls Superb instant grab, leading to a safer work site when working at greater heights Labor cut in half due to the rapid set and ease of application 4 gallon bucket Approved Substrates (Wall Only) Drywall Masonry Concrete Cement Board Foam backer Board Roller-applied acrylic waterproofing membranes and sheet membranes Fiberglass Well-bonded Clean Ceramic Tile Steel Aluminum Stone Coated Metals Exterior Grade Plywood Tile Panel Types Thin Porcelain Tile Panel Epoxy/Fiberglass-backed Thin Porcelain Tile Panel Urethane/Fiberglass-backed Thin Porcelain Tile Panel