RCD Corporation's® Glasscoat® is an inorganic woven fiberglass mesh; coated on one side with pressure sensitive adhesive. Rolls are individually labeled and shrink wrapped. Glasscoat® Adhesive Backed Fiberglass Mesh reinforces adhesives, coatings, mastics, and sealants used in the fabrication and installation of air ducts and thermal insulation. Glasscoat® is also known by several generic descriptions like: fiberglass scrim, fiberglass tape, and fiberglass cloth..