Is it possible for you to submerge fiberglass cast?

Mayo Clinic says.... "Fiberglass casts can usually get wet. If your child has a fiberglass cast that's lined with a water-repellent liner, it's probably OK for him or her to get the cast wet if the doctor approves.Keep in mind, though, that even a fiberglass cast can become uncomfortable and irritate your child's skin when wet. As with a plaster cast, consider covering your child's fiberglass cast in plastic or.