I repaired my fiberglass Armstrong shroud a few years ago and it's still holding. The fiberglass was real rotten and large pieces were missing. I taped cardboard temporarily over the holes and covered the cracks and holes with fiberglass tape and polyester resin. Then I used a can of aluminum spray paint. Looks good from street level and like I said, it's still holding (for now). By the way I think the Armstrong shrouds are about $250.
Sail on silver girl. Sail on by. Your time has come to shine.