So when I was an obsessed art student in my tiny duplex apartment, I spent a great deal of time cutting Japanese paper stencils with an x-acto knife.  I still have the scars to prove it and obviously some of the stencils survived the 6 plus moves after they were so diligently cut.  I am trying to remember why I did that. Nope got nothing.  Oh wait I remember I was making scarves. Wow another issue I have, scarves. I still make them to this very day. Back to the purses. I love a good vintage bag and have a ton, so on a nice 60 degree day I gathered up my stencils and my bags and headed outside. I say 60 degree because I have found that it is a good temperature for spray paint. Too hot and the paint never cures, too cold and it dries too fast and you are also cold. I sprayed a light dusting of spray adhesive on the back and let it dry a bit.  Spray adhesive is really nasty stuff so make sure to wear a mask.  One time I inhaled a puff and had a nice coating of ick on my throat for days.  I let it dry a bit because I did not want it to leave a residue on the bag. Once my stencil was in place I sprayed and let dry in the shade. Usually one coat would do it, in some cases I added another layer.  I still have ton of bags they just have birds or dragons on them (thank you Portlandia)