Polyspan Covering
Polyspan is also available from TCI Hobbies at 800-606-0097 they also have a website.
In regards to this product be aware that it is a great product to use but requires the use of dope and while it can be heat shrunk moderatly it can be difficult to do wing tips with . Also you need at least 3 coats of dope on it before you can lightly sand it smooth. Less then that and you will get a fuzziness to it that will be almost impossible to get rid of.
To save weight with these products as it only comes in white use anyline dye mixed in with your dope. It is not opaque but if you have a nicely built plane a little translucense is a great advertisement to your building skills