Thinned with GP Lacqor Thinners, they brush and spray well. Yes, the thinners do attack the surface, but this provides a "key" that makes them extremely durable. Especially when tents and banners are folded up, regular paints tend to crack.

I also use computer cut vinyl masks for both painting and spraying small text etc. The thinners will attack the mask too, but the secret is several thin coats allowing each to tack off.
The first coat will be dull due to the chemical reaction with the surface of the vinyl but following coats with be glossy. It's a matter of trial and error how much you thin the ink, but its a matter of thinner the better.

The only drawback with inks are that you can't layer colour over colour, especially if painting. One ... they tend to be transparent. Two ... the second coat eats into the first and layered colours will merge. Solution is masking.

Another advantage of ink is the cost. A pound (quart) of ink is expensive but goes 10 times further than paint. It also drys, and hardens extremely fast ... we are able to paint one side of a tent in the morning on the floor of my shed, then turn it over and do the other that afternoon and deliver next day.

Tip: We always apply a liberal dusting of talcum powder which prevents the layers sticking together, as the ink has a full 72 hour curing period. The customer is advised to wash of the talc with a damp rag later and to re-talc the banner if it is to be stored for any period.