no i just followed the how-to vid. which had me use a thick plush fabric and then resin the ***** out of it.I ended up going through like 3 cans of resin.
from experience, it will reduce your sound if that fiberglass vibrates any little bit, yeh it may work and may not crack, but u are losing db's, but if u have a how to video then it should be perfect lol haha