According to our good friends at Wikipedia,fiberglass is a“common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet (called a chopped strand mat), or woven into a fabric.”
“Cheaper and more flexible than carbon fiber, it is stronger than many metals by weight…”
“Applications include aircraft, boats, automobiles, bath tubs and enclosures, swimming pools, hot tubs, septic tanks, water tanks, roofing, pipes, cladding, orthopedic casts, surfboards, and external door skins."
"Fiberglass covers are also widely used in the water-treatment industry to help control odors.”
So fiberglass definitely has a lot of qualities a musician looks for when it comes to instrument protection. If it can keep a boat afloat, it’ll probably do a good job protecting your beloved string instrument as well!
However, not all fiberglass cases are made the same. Here are some things to keep in mind when it comes to fiberglass cases you want to try and avoid.