I just finished a weekend of working with Dynel instead of fiberglass .
Covering the bottom of the 22' Sam Devlin designed tugboat that I'm building.
This stuff, dynel , has it all over fiberglass cloth.
It is lighter by 2/3 's and stronger by a factor of 6 or 8 .
It conforms to curved surfaces better too .
PLUS , it doesn't make you itch and scratch .
I got it in 54" wide roll .
Dynel is polypropylene cloth BTW.