Painting labels using toner transfer method as mask?

[add4]

I am wondering if anybody tried this method to get a kind of stencil for painting labels and if it would work?
- Paint background color (in my case, powder coating)
- Print the art and labels in negative with a laser printer on high gloss paper
- Iron it on the box
- Apply the label color using spray can paint or powder coat
- remove the toner using acetone
- clear coat on all of this

open questions:
- Would the toner transfer method work on an already painted box?
- Would the toner resist the heat needed to cure the powder
- Would the spray can paint/ cured powder resist the acetone when removing the toner?

Is there any other method to create a stencil from artwork done on computer?

The way i see this, this could be a way to get MXR type labels, painted on the box, and i'd love that
Thanks for sharing your experiences, if someone has already tried that

Peace

[add4]

just stumble onto this :
http://www.freestompboxes.org/viewtopic.php?f=47&t=4855

anyone has other experience on this subject?