Has anyone tried using the uncertified dacron that Aircraft Spruce sells? The weights do not correspond exactly to Ceconite, but they are close. I am preparing to cover a Pitts 12 using the Kimball double covering method and was considering this fabric. The Kimball double covering method uses the heavy weight ceconite with a full covering of light weight instead of tapes. At the very least the light weight dacron seems like it would be suitable in place of the light ceconite.