Evercoat Sea-Glass 1.5oz Fiberglass Mat Non-WovenThe Evercoat Sea-Glass Fiberglass Mat is best used for bulk "build up" when repairing holes and badly damaged areas. This mat is 100% fiberglass in a non-woven state; also molds and builds for repair of curved surfaces on fiberglass objects. Best for high build-up repairs; Will conform to any shape; 1.5 ounce weight; Sizes Available: #940: 38" 34" (1 sq. yd.); #941: 38" x 102" (3 sq. yds.);