What kind of fiberglass cloth should you use to make a sub box?

For making a sub box, it's best to use a high-quality, woven fiberglass cloth, typically in weights ranging from 6 to 10 ounces per square yard. A heavier cloth provides better strength and durability, while a lighter cloth can conform to contours more easily. Look for fabric that is compatible with epoxy resin for optimal bonding and a smooth finish. Additionally, consider using a mat or combination of mat and cloth for added structural integrity.