I wanted to try this "Simply Spray" paint I found - there's a more liquidy dye/paint
and a thicker one
that's designed to give a screenprinted effect.
Here's a test with the thick stencil one:
My stencil; just for this test I used cardboard. I found it tended to warp a bit from the paint so in the future I'd use plastic. There were smaller loose pieces that had to fit in the centre of motifs so I used basting spray to keep everything secure.
I found the paint comes out more like a stream than a spray, so you have to adjust your technique. The instructions say to start spraying on a piece of paper towel and then move onto your stencil; I found this worked well. It kind of looks like a horrible mess in this pic and I started to panic, but once I took off the stencil it was all good.
Result: Looks pretty nice! The paint is thick and shiny like silkscreen.
I also tried the same motif and fabric with the more liquidy dye-type paint, but it didn't work well on the synthetic fabric; couldn't soak in so it just beaded up. It works much better on cottons as it bleeds a bit; it's clearly designed for tie-dye effects or soft shadowy stencilling.