Cels Forum

For my backgrounded cels, I put a comic book bag in between
the cel and the background. They're made of the same 
material, polypropylene, and probably more readily 
available. They aren't big enough to cover the whole cel, so
you just have to position the bag so it's under the painted 
area of the cel. Depending on the cel, you might need more
than one bag. This is not quite as safe as putting 
everything in seperate cel bags, but hopefully it will be
okay until you can get a supply of cel-sized bags.