Needa get me a new dremel, did that leave a rouch edge to it though? If the foam reacts to heat you might get smoother bullet holes with a heat engraver or even with a hot glue gun tip of a glue gun, but dremals probably best for the general wear a tear, or you might just wanna use a heat wire to make it look like metal instead of havinging the rough edge idk. Just thought I'd throw in there.