Like gaj2714 said: First resin (the outside), then fiberglass the inside. This is what gives your armor structure. After that, bondo for the details, primer, paint, and viola! Pictures would be a good visual reference for us to be able to give you any type of advice. Also, before you use any of the hazardous materials, make sure you read up on how to use them safely, and obviously in a well ventilated area. Safety is key.