Well actually LS, NAS armor, which is made in a similar fashion as Adam's, Sean's, and any other molded armor is actually battle tested in Paintball. But lets look on a physical level.
Paintballs are made of gelatin and water-soluble paint, which is very low density, Plastic is a polymer, a very strong one, and with 7 layers of plastic, it gets pretty freaking hard. Also the visors are tough as well, they were meant to protect your eyes from bugs... moving over 60 MPH.
Also, Fiberglass is about as hard as plastic, so it will take a hit easily.
Just make sure the armor is hard as rock. But make sure it is light so you can wear it.