I'm cosplaying as Magik in her costume from Uncanny xmen. I'm currently making the spiked arm armor. I already built the base out of carstock. Its been reinforced with masking tape and it feels pretty sturdy. I'm looking to put something over it to harden it but I'm having a hard time deciding what to use. I don't want to use bondo because it's such a pain to sand and the spikes will be unbelievably annoying since I don't own a dremmel. I've never used fiberglass resin and am hoping to not have to deal with that mess. I bought Elmer's Wood Filler but im reading that it needs a lot of sanding as well. That leaves me with some sort of clay and plastidip. I'm thinking clay is going to be very heavy but plastidip might be too thin. Advice would be greatly appreciated, I'm really stuck on this!