/diy/ - Do It Yourself

I would like to reinforce / sound deaden the interior plastic trim pieces and center console of a late 90s vehicle - what is the most sensible way to do this? almost everything inside is made of cheap plastic, which sounds and feels bad when driving. could I lay fiberglass on the inside of the trim pieces, and then reinstall without messing up the fitment too drastically? I've never worked with fiberglass, I'm not sure if it would be too thick or if there's a better material for my purposes. maybe like a spray that could lend some rigidity? input appreciated