Cut away the excess fiberglass cloth and sand the rough edges down. You will want a dedicated pair of scissors for cutting fiberglass cloth, and NOT your fabric scissors - these will get dull and damaged easily! An ideal pair of scissors for this task would be short and designed for flush cutting.
Hobby Lobby carries a specialty fabric scissor which looks like a miniature pruner, and works exceptionally well for this purpose. It will be linked at the bottom of the tutorial.
Now, your product has a hard, durable feel, but it has the rough texture of fiberglass. You want it to have the smoother texture of metal. To achieve this, coat the armor piece(s) with a sealer such as Mod Podge Matte. Spray-on truck bed liners also work for this purpose. Plasti-Dip can be used, but will require several coats to fully cover the fiberglass texture.