I found a child's motorcycle helmet for a couple dollars at a second hand store and applied some foam strips to it. The foam is easy to work with but its not easy to paint. I thought I would flood the foam with several coats of primer, sand it, and paint it, but it was a lot more work than I anticipated. Next time I'll use Apoxie Sculpt because its pliable, dries hard, and is easier to paint.
The backpack is made from foam flooring I purchased from Costco. I hardened the backpack by applying some fiberglass resin because I expect Christian will play with it long after Halloween. Another lesson learned? - I thought the resin would be enough but next time I'll throw a little fiberglass cloth in to strengthen it.
Here's a leg. You can see I turned the diamond plate pattern inward and used the smooth bottom of the flooring for the exterior. Straight cuts are easily made with a bandsaw. I also made a jig to hold a razor blade on a perfect 45 degree angle and cut the corners where the pieces joined. Gorilla brand instant glue worked best for joining the pieces. I later reinforced the corners with thing foam and a more glue. No resin on the exterior - I want it to remain flexible so he can walk.
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