I went to Wal Mart today and carried a piece of Sig Koverall. I gave it to the clerk and asked if they had material like that. She said no, then I asked if there was something similar. Together we found some white polyester lining material that is presumably the material mentioned in this post. I bought a couple of yards (at $2.43/yd) to experiment with. It is a little lighter in weight than Koverall. It has about the same thread size but is a lower thread count. Koverall has a noticeably tighter weave. The more open weave of the Wal Mart material will require more dope to fill in the spaces between threads, and the lower thread count is obviously less strong.

I have glued up some frames and plan on making some test panels to compare the two materials. The Wal Mart stuff may indeed prove to be a practical covering material (especially for smaller models), but it is NOT the same as Koverall.

It still makes little sense to spend several hundred dollars and weeks of work building an airplane then use a questionable material to save less than ten dollars.