Fiberglass cloth or tape is applied to surfaces to provide reinforcement and/or abrasion resistance, or in the case of Douglas Fir plywood, to prevent grain checking. It is usually applied after fairing and shaping are completed, and before the final coating operation. It is also applied in multiple layers (laminated) and in combination with other materials to build composite parts. 6-oz. Fiberglass Tape (3" x 10 ft.) $11.33 6-oz. Fiberglass Tape (3" x 50 yd.) $60.04 6-oz. Fiberglass Cloth (30" x 42") $12.43 6-oz. Fiberglass Cloth (30" x 15 ft.) $52.65