I found this topic showing how to make your own plastic and thought it might be worth a try. Its non toxic and requires milk or cream, and vinegar or lemon juice. A couple layers of this stuff in your pep model might work out, who knows.
http://www.instructables.com/id/Homemade-Plastic/
I hope this would be the place to post this.
http://www.instructables.com/id/Homemade-Plastic/
I hope this would be the place to post this.