Vinyl Glue
 

Anyone know of a strong glue that will bond vinyl to plastic/nylon. My tractor seat separated from the back. I dont think that 3m weatherstrip(yellow) glue will be strong enough.

I can't believe nobody took a stab at an answer for you. I'd maybe consider that Gorilla Glue. That stuff is unbelievable. What kind of tractor do you have by the way? I've got a Kubota M6800 and my dad has a MF 135.

3M has a high temp spray glue that might work for you.
w
3M

Not sure what you have in america, but over here in the uk some of the 'impact' type glues are pretty good for this sort of thing.

Alternatively, the spray on glue that profesional carpet fitters use for sticking vinyl floors downwould probably do the job (just make sure you get the good stuff, not the cheapo rubbish!!)