Re: Monark II springer fender
I did once... to make a costume of an Cadian trooper.
Stuff was messy to work with but surprisingly simple to use and forgiving. and stronger than I would've expected. I had a test piece of normal box cardboard about one and a half inches by two with three layers on each side shrug off an overhead blow with a baseball bat while unsupported in the middle.
You have to be patient with it because it needs to set and be sanded between layers for it to be strong, also paradoxically the less resin you use the stronger it is so you have to use a plastic card to squeeze and flatten each layer.
the hardest part for me was getting a piece of cardboard into a bowled shape before the resin touched it, I used lots of carpenters glue and muffler tape.
Ask me about Chainmail in southern Ontario!