OK, I burn a screen and I get pinholes.
No problem, I fill it in with blockout or cover it with tape or whatever.
But, what about when the opposite happens. I have an area that is non-printing, that was supposed to be printing. How do I fix that?
I tried using just a dab of stencil remover, which worked, but only because it was not a problem that it took out more than just the area that I wanted. If this needed to be REAL precise, what would I do?
Sometimes when that happens I have a spot removal gun for blasting out finger prints on printed t-shirts and zap it out. But if not precise you get the same results of blowing out part of the stencil you wanted just like using emulsion remover.
Mask off the area with tape on both sides and then use the remover so it only really makes contact with the troubled area.
That's pretty much what I did. And it worked OKAY. Not perfect. Whatever.
When this happens at my shop, my boss uses a tiny needle and a magnifying glass. Only for small areas, but it works. Just poke out the emulsion you don't want on the screen. It doesn't ruin the screens either (as long as you're careful). We have screens that are 2+ years old here that we use everyday.
As for pinholes, try coating each side of the screen twice, cleaning the screens more diligently, and cleaning the area you leave the screens out to dry (dust will settle in the screen and give you pinholes)
If the area looks like it sprayed out but isn't printing, it could be emulsion haze that dripped down while drying. SCREEN OPENERŪ works at opening it up, but it makes your penis stop working for 6 hours.
Non-printing areas that should be printing can sometimes be opened up with a good screen wash chemical. If it's a really open mesh then sometimes there's a clear emulsion residue that slides down the screen when it's drying. That can be scrubbed out with a wet paper towel.