Let's just say it will collapse on you... Fiberglass turns the paper and resin into a solid piece of armor, without it, it's very flimsy. Now it has been done, without fiberglass. Nintendude did a suit without fiberglass. But he destroyed the boots and other parts took damage from just 1 convention. If you want the armor to last, you need it.
So should i put resin on, put the fiberglass cloth on, put resin on top of that, and then resin the outside?