Fiberglass Cloth aka fiberglass fabric is a popular reinforcement used in composite construction and in repair work. This woven fabric provides excellent strength and is an affordable way to build molds, create composite parts and make repairs.
If you are looking for a smooth, more transparent finish, a light weight cloth would be the best option. A light weight cloth can also serve as a good waterproofing layer. If you need good strength and to build thickness, a heavier cloth should be chosen. Heavier cloth is easier to handle than the lighter cloth.
The 6, 7.5 and 10 ounce fiberglass fabric are the most commonly used. These are all plain weave and provide uniform strength both horizontally and vertically.