Vinyl Cut PCB resist

This image can be cut on a vinyl cutter, then attached to a copper clad board before etching it.

The traces you get from this process are really well defined.

If you put the board in a jar, you can agitate it very well with much less hazard of splashing.

For more info, check this post out: http://blog.makezine.com/2009/10/02/vinyl-cut-pcb-resist/