Description Gerson Blue Tack Cloth/Rag ( Base Coat/ Clear coat 2000) Soft Cotton Tack Cloth. Packet of 12. 100% Bleached Cotton Gauze Substrate Soft cotton mesh material contours to surface shapes. Completely removes surface particulates without leaving harmful residue. Wax and Silicone-Free. Designed for Waterborne; compatible with all paints Size: 20″ x 16″