How not to get a halo??

Nick, it can be a problem when you can't tell AC's from DC's. ;)
 
I use a q-tip instead of the bigger pad and it gives me much more control and a cleaner result. Sorry but I can't remember who suggested it when I asked.

Patrice
 
The quality of your stencil also affects if you get a halo or not. The stencils that I use from TUStech are great, infact when they demo, they actually intentionally apply electrolyte to the back side of the stencil to hold it in place while you etch. If the stencil only allows the current flow through the mark and not any other part, and the stencil is flat on the surface, you wont get a halo. You do however need to make sure you dont have too much electrolyte on the pad or that will get under the stencil and pull it away. (resulting in a halo as the current is allowed to travel elsewhere than just where the mesh of the stencil is)
 
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