This is one of the largest art projects I've done with friendly plastic. I used a real grocery bag as my model, but I created a support for the plastic out of a metal mesh used for sculpting with papier mache and plaster. I raided one of my tupperware bins of bits, leftover offcuts from past friendly plastic projects, many of which were "snappers".
Oh how I hate the snapper.
As the plastic ages it gets brittle and just trying to cut it makes it crumble. That's just one dilemma to using this plastic. The second is it goes from not melted to melted in a flash, and when it does melt, it flows like oil. Liquid. Very very hard to control. Impossible, so you need it to go where you want it to be from the outset. I never use the snappers for any main item. I save it for large pieces where I use it as filler only. And for this it is fine, provided you don't have to bend the object you've created. So long as it's stable and not moving you are okay to use it.
What I learned while doing this project is that friendly plastic melts (D'OH!) and so it went through the metal grid I got as a support. Go figure. Never foresaw this!
I bent the wire mesh to be the exact size and shape of the paper bag and then I unfolded it and laid it out as flat as I could. I took my heat gun and started melting plastic onto the mesh... and immediately saw it run through, so I lined up the inner paper bag with the mesh to catch the overflow, thereby giving something for the snapper plastic to adhere to instead of my floor and simultaneouly gluing the paper bag to the wire mesh to the plastic.
BTW, here's a tip: friendly plastic makes an excellent durable glue if warm temperature is not a factor. We fixed our deadbolt with it and it held for years, actually it was still working when we moved away, and someone I know fixed their pool ladder with it. Many uses for friendly plastic for sure. But I digress.
So the other thing that happened which I didn't anticipate is I got a much more varied and interesting surface that was slightly dangerous.
My sculpture was called Surprise! and I positioned a lamp inside of it with tissue paper hiding the lightbulb so it looked like whatever was in the bag was glowing. If you touched the bag, and everyone wanted to touch it cause it was softly glowing, and the surface was so rich and varied with friendly plastic, so shiny, add to this that people never know what this material is and are very curious, well if they touched it the metal edges were sharp! Beware!
So while it was inviting, all glowy and shiny, there was danger and this is what I think of surprises btw. Not every surprise we get is a good one.
Here's what my final installation looked like with the lights off ...