I've been working on casting a form from a mannequin (don't we all have mannequins hanging around?) using paper mache. It's the first prop for my Halloween theme this year, and probably the one that will take the most time.
Thought I would share the process so far.
Miss Mannequin gets covered in tinfoil. To help keep the tinfoil in place without actually attaching it to the form, I've put tack adhesive putty on spots around her body (especially around the facial features). I want it to stay in place, but I want to be able to remove the tinfoil and paper mache form fairly easily when I'm done.
Covered Miss M with a layer of newspaper using watered-down white glue. Basically, I rip newspapers into strip, coat them in the glue/water mix, and smooth them over the tinfoil. For a more detailed explanation of my technique, check out my tutorial.
Since she is so large, for the first layer I used fairly big pieces of newspaper for the torso. After it was completely dry, I added a second layer of more traditionally small pieces. The smaller pieces tend to give a smoother finish and allow you to work around angles.