If you use the repositionable adhesive spray, I seem to remember the instructions saying to let it dry on the stencil first, then adhere to surface, it shouldn't leave a residue. I've used it in the past for applying stencils around my Mum's kitchen [shudder, leaping bunnies anyone?]. I should think that once the paint is dry a damp cloth over the wall should remove any remaining residue.
I've had the idea to spray a stencil frame around a canvas picture on my wall (will take it down first obvs).
I've got my stencil made and have tried a few practices on vertical cardboard to investigate paint run (car paint rubbish, plasti-kote metallic fine). It will be a single repeated pattern so I'll need to reapply the stencil many times.
My question is this: After I've removed the stencil from the wall and finished my design, won't the residual spray mount left behind attract dirt and dust? It's looking all sticky on the cardboard box I used. Is there some way to remove it, am I just being an idiot?