I remember the colorforms stick-on things from when I was a kid. They are like a plastic that you can press on to a surface and it will stick. It's not adhesive but will stick to glossy surfaces I believe.
I would think this would be a great masking agent for camoflage and such.
Does anyone know if colorform sheets are available? I'd think that perhaps a glossy surface might make them stick, and they are easy to cut to shape.
Cheers,
-Dave