I am working on a costume with armour, and I thought you guys could help me with a problem. I am using fiberglass over a cardboard base. this is my first time to use fiberglass in a costume, so I am working off of general tips I found. Once the fiberglass dries, it doesn't seem as hard as it should. I know it is completly dry, but the cardboard is still bendable.
My technique is simply applying the fiberglass mixture over the cardboard. what am I doing wrong?