Which of the two materials the NYLON or the VINYL.
As I said, I found some of the NYLON material and some POLYESTER jacket lining and made some tests with it and my results where the following:
NYLON: I have it in two versions one sealed and one un-sealed, they both behave the same way, they are heat shrinkable but it requires hi temp to do so and it gets tricky, but if you can practice and manage to master it, the rewards are that you will have a material that is very resistant to punctures (this material is what hang gliders and chutes us but in a light weight) and weather.
POLYESTER: This is a cloth type fabric it heat stretches very good but you nead to seal it either with dope or latex paint like it was mentioned before it's less resistant to tears than Nylon.
On both material you will need to aply a coat of some heat stick compound to the air frame in order to bound them.
I still prefer the VINYL STICKER material, this is self adhesive and the only thing you wil need to do is to heat shrink it with a heat gun.
It comes in several widths and you can paint over it with vinyl or acrylic paints(automotive paint stores have a wide range of colors)