Tavy Thin-Skin 100 Sq. ft. Roll One roll of TAVY Thin-Skin Underlayment will cover 100 square feet Requires one gallon of TAVY Thin-Skin #007 Glue. Sold Separately. Amazon item # B000NB78OM Tested by Tile Council of America The TAVY Thin-Skin Two Part Underlayment System was developed to provide an underlayment for tile that could be installed over any surface without adding additional height to the sub-floor. TAVY #007 Glue is a high-end multi-purpose adhesive high in solids, which will adhere to any surface.