Re: Painting Cordura pack material?
I am a custom gear maker.
Krylon sticks to nylon. Used it TONS on my own gear over the years, in Stan and on a bunch of other guys gear too.
I have painted cordura before and after sewing it. It is FINE.
Older Krylon was a temporary fix, it would start to rub and scrape here and there. No sweat, just touch it up. The solvents and propellants in it do not harm the cordura. (One fear a maker would have about your using it.)
I have not used it on cordura YET, but their Fusion line should bond to the cordura better than the old stuff. It does very well on other plastics.
Why they would void the warranty.
A company the size of Mystery Ranch, Kifaru, etc will want to protect themselves from liability from someone doing something nuts and trying to blame them. "All I did was wash it in gasoline and it blew me up when I lit a smoke."
With my TQ's I have to include a legal disclaimer saying "do not apply to neck or throat."
As said above, lite mists and let it dry in between misting. When you get what you want, let it sit in the sun for a few days. It will smell VERY STRONGLY of paint for a while. Just let it air out and the smell will go away.
Good luck with your project.