Why 10 oz Fiberglass Cloth Is Ideal for Heavy-Duty Reinforcement Projects https://www.zsfiberglass.com/w....hy-10-oz-fiberglass- Learn why 10 oz fiberglass cloth is a popular choice for heavy-duty reinforcement projects where greater strength, durability, and structural support are required. With its higher fabric weight and robust construction, 10 oz fiberglass cloth can be used in marine components, industrial parts, composite panels, repairs, and demanding fabrication applications.