Gold Bond® eXP® Tile Backer is an acrylic coated moisture and mold resistant gypsum panel specially designed for use as a substrate for tile applications in high moisture areas. eXP Tile Backer is manufactured with an enhanced moisture and mold resistant core and facer. The facer is composed of an acrylic coated fiberglass mat which provides superior moisture resistant capabilities. eXP Tile Backer is identified by National Gypsum's original Purple® color on the back and gray acrylic coating on the front. Gold Bond® Brand eXP® Tile Backer consists of a moisture- and mold-resistant gypsum core encased in an acrylic-coated, specially designed fiberglass mat on the face, back and sides. It is available in either a Regular or Type X core. The glass mat is folded around the long edges to reinforce and protect the core. Use it as a substrate for tile applications in high-moisture areas, including showers, bathrooms, indoor swimming pools, laundry rooms and kitchens. It is also a code-compliant substrate for tile and other finishes in both wet and non-wet areas, areas of high humidity and fire-rated assemblies. It is ideally suited for a variety of interior applications.