Painted Totes

I bought a bulk lot of tote bags from ebay...why I dont know! :P They are fairly poor quality although perfect for me to test my painting skills on.

I made the I heart Nerds bag for a friend who loved it!

The elephant one(if you can see it) came about from searching for an elephant template for the elephant bag inspired by Prettykittyfire. I used a sponge for the sunset, I messed it up a bit but still like it! :)

Question for anyone else who uses fabric paint.....I put cardboard wrapped in cling film inside the bags to stop it going through or sticking to the cardboard. However I now have cling film stuck to parts of the paint that I just cant get off. So what do you put inside to stop the paint going through?