That really depends on the formula. I have about five of them (only one of them tested).
- I have a styrofoam/elmers one. It's not strong at all and there are no good chemical bonds that work for it. It's super sticky, and it looks like webbing though.
- The cellulose acetate formula was good at first but after checking it, it wasn't elastic. Plus it would be very expensive
-The iron/cyanoacylate/neoprene formula was very much experimental and wasn't solid enough.
The one that would work best (that a non-scientist could make) would probably be the polyvinyl alcohol formula. That only works with graphene and cyanoacrylate, but it works.
-Finally, the best formula so far (in my opinion) is the nano-cellulose formula. This is because it contains every single property in the comics. Until NC hits the market though, we would be stuck on that.
I had a new theory on a formula, but even in my head it's not well developed. There is a glue that is excreted by a bacteria that is composed of sugar, and yet it is stickier than cyanoacrylate. Sugar also creates long strings when agitated in a thick liquid. Graphene and nanotubes have both been made from sugar too. So sugar is the ideal base, but unfortunately, I don't know how to chemically modify it that much.