Homebrew PCBs

"Leon" <leon355@...> writes:
> I meant dust on the artwork or the resist, before exposure.

Ah!  Yes, it could be that.  I'll add "spray print with compressed
air" to my list of things to do.  No, I'm not going to try rinsing it ;-)

I suppose I should wash the plate glass I'm using to hold it down,
too.