Last night I was trying to print with plastisol and I'm not sure why it didn't print. I gave it a flood stroke and then a good zip stroke and no ink went onto the shirt. The ink did go through to the printing side of the screen, but I'm not sure why it didn't print. It might be pretty old plasitsol and it was pretty thick or maybe the stroke wasn't hard enough.
Also how high above your material do you keep the screen?
Your screen should be 1/16 to 1/8 above the garment for off-contact printing. This keeps the screen from touching the garment untill the actual print stroke. You also want to have the squeegee blade angle between 45 to 60 degrees.
Plastisol Ink is thixotropic which means it will stiffen up when not in use. You should always mix your ink before printing. If it is still to thick you might want to add a balanced reducer. For light shirts you want the ink to be smooth and creamy and for darks it should be thicker.
The thinner ink will give you sharper prints with good penatration. this will also minimize the buildup on the bottom of the screen.
are you absolutely sure it touches the shirt? I heard it was no contact between the screen and the shirt.
Yes, the screen has to touch the shirt in order to print the ink. The screen shouldn't be laying directly on the shirt all the time, but it should be close enough that it can press down on the shirt when you pull the squeegee across. Then the mesh will snap back up off the shirt after the pressure from the squeegee is gone.
Well I'm not a screenprinter so I can't be too much of a help. But going on what other people have said in this thread you need to lower the screen until it's much closer to the shirt and then experiment with pressure.
You shouldn't press super hard, because you don't want to mash the ink into the shirt, just lay it down evenly.
Also, you might want to consider doing some test prints on old shirts or other fabric until you get the hang of it so that you don't waste nice new shirts.
Sean, You should hold your squeegee at a 45 degree angle for flood strokes and a steeper tilt for shear. Sounds like you had to high a mesh screen and to thick of a ink. For instance: white is very thick and will not print through a super fine 305 screen. What exactly was it you used? That would help. Off contact is important, but the right ink/screen mixture is more important.
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so exactly how much pressure do you use when your doing the print stroke? and how do you know your using the right amount?
Once you have your off-contact distance set correctly, you just press hard enough to press the mesh down on the the shirt, and then pull the squeegee across it. It will push the ink through the mesh and onto the shirt.
okay I tried another round. The green came out, which was the first color, and the black didn't come out. I diluted both colors. I think my screen for the black wasn't shot that well. The emulsion was washed out, but it was a bit hazy. The screen is a 122 or 120 mesh. The same thing happened when I tried it again. The ink went through to the printing side but not to the shirt. I think this issue is about diluting the ink.
I wouldn't "dilute" the ink. Yes you can (and probably should) thin it down with a reducer (but only by 5% - 10%), but for the most part plastisol inks are good to go.
My guess is your are underexposing your screen. You said your image was a bit hazy. If you under expose your screen and then wash it out, there is a film that will flood over the printable area. It seals it shut. So even though it looks like it should print, it doesn't.
What kind of exposure are you using? What type of film? What emulsion and what are your time settings?
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My Plastisol didn't print. 
Last night I was trying to print with plastisol and I'm not sure why it didn't print. I gave it a flood stroke and then a good zip stroke and no ink went onto the shirt. The ink did go through to the printing side of the screen, but I'm not sure why it didn't print. It might be pretty old plasitsol and it was pretty thick or maybe the stroke wasn't hard enough.
