How to Sand Fiberglass: A Step-by-Step Guide for a Smooth, Professional Finish
Fiberglass is strong, light, and useful in boats, cars, tubs, shower pans, and many repair projects. But when the surface is rough, scratched, or uneven, the final look depends on one skill: sanding. If you know how to sand fiberglass the right way, you can remove defects, prepare the surface for paint or gel coat, …