Esaki silk with nitrate and butyrate dope. Hey, you didn't specify iron-on plastic film covering only.

I agree with MinnFlyer - Ultracote is easier to use than Monokote due to the lower application heat, but both are very similar. I use and like both. The real key to either covering is to make sure you put a good pull on it when you put it down which will lessen the chance of wrinkles when the weather changes from winter to summer and vice versa.

Hogflyer