Glass Fiber:
Glass fiber used for reinforcement are very satisfactory. For corrosion resistant equipment approximately 95% of applications normally involve the use of the glass fiber. Glass fiber appear white because in the dry state there is multiple refraction of light.
There are many kind of glass. The standard grade for boat is ‘E’ glass or electrical grade. ‘S’ glass is stronger but more expensive grade. ‘R’ glass as better fatigue resistance.