Cheers,
We are pretty limited to inks we can get here.
The best thing I can get with decent opacity (all sorts of opinions from reps) is nylobag.
I'm gonna test nylobag with a hardener.
If that's no good, I'm gonna wipe first with ISO print nylobag with hardener and then waterproof spray over the top. That's the gruntyest solution i can think of and can get my hands on with the best chance of biting the fabric... Thoughts?