I was inspired by SpiderRider's amazing spider and decided to build one of my own. According to SpiderRider, the abdomen, or as I regularly refer to it as a giant spider butt, was created with a fiberglass and resin concoction. Well I have no clue as to how that process works, so I decided that paper mache was the route I would take. This is where things get sketchy as I have zero patience for slow, tedious work or respecting proper drying times. So only managing a couple of layers of newspaper strips and flour/glue paste over a two foot wide yoga ball, and of course thats not nearly enough layers to ensure a solid sphere, I lost patience. I then broke out the Great Stuff and began smearing it with my hands all over the spider butt and ultimately was enthusiastic about the result. It created a hardened outer shell, kinda like a a M&M, but I found it near impossible to create a smooth layer. It ended up more like a cottage cheese texture the way it expanded. I was hoping for smooth, but the bumpy texture grew on me as I carried on smearing. It became very strong once cured and is very rigid and will not collapse the sphere.
Here you can see the Great Stuff shell over the paper mache layers.
I repeated the process over a childs bouncing ball and a small balloon for the head and thorax.
The spider isnt done yet, but here you get the ideal of what Im trying to acomplish. Just wanted to share this as it might be feasable for other types of projects as well.