I'm having this problem both when I print colours on top of one another and when I print colours on their own, but it's more noticeable when they're on top of one another. I find that the paper attaches ever-so-slightly to the screen, so I have to pull it off. The WHOLE SHEET doesn't attach, though, so when it's pulled off, I get this like uneven ink coverage which I'd sort of describe as "pooling"... it looks like water pooling in an uneven road SORT OF. It has happened a lot MORE when using paper that buckles a bit under a lot of ink... so the surface IS actually uneven. My solution for that is to not use 10pt chipboard for things that involve large areas of colour.
Sometimes I sort of like the effect, but it's an annoying thing to happen most the time. It's far less obvious when the prints are dry than when wet, but still! This happens BOTH with latex paint and regular water-based ink (union ink) for me.
Is there something I could be doing to make sure that the paper never sticks to the screen? Is that the problem? 'Cause it kind of seems like it is. It sort of seems like a vacuum table setup could do something to help, but that's not really an option for me right now.
Is this an "off-contact" problem? Right now, there is little or no space between the mesh and the paper when the screens are laid flat: I'm using jiffy clamps and this like smooth white faced particle board (a "platen" you could call it maybe?) to put the prints at what seems like the right level. Can this be solved by raising the screen slightly somehow for printing? I guess I could just TRY that...