Well it was from a search here that I read about silkspan on the tips instead of the poly span but now that I see how they are done with a bit of heat I get it
Not sure how fast Sig Mfg stops listing stuff, but just looked and several of the things I ordered earlier this year are no longer in the list of add to cart items....dang, should have got more than samples of each ( I ordered on each of every covering they had on the site) so I have one sheet of 00, one GM, and one SGM and neither is enough for a wing except the Koverall
I got a 3' x 9' of Dave Brown Skyloft a nylon covering that is put on wet
The Poly T I got from RSM looks very consistent for the whole 15 feet with no voids
I also got a few yards of silk from Dharma and the 8mm colored stuff looks and feel good
Spent a few days now reading almost every SilkSpan thread and don't see any definitive way to tell the old "good stuff" from what ever is offered now...but is is no big deal as I can use Poly, Silk, or Mono and arrive at the finish I desire for these vintage combat planes I am building
Thanks Robert for the videos and all others for their input