An excellent 5-page article by Martin Hunter with lots of photos explaining exactly how to cover balsa structures with Solite film. This is applicable to any film covering.
Five-micrometer Mylar film is the best covering for many RC micro aircraft. Here’s how to apply it to a balsa frame airplane. (Courtesy of the Wayback Machine)
Applying tissue over mylar is lighter than using tissue and dope, as the dope adds a lot of weight. Here is a step-by-step guide to using this covering method.