The main point for you is to elevate your screen
slightly and maker sure the screen is clear of ink - perform a clearing
print after every 2-3 prints.
You can thin the ink down by either:
1. Adding a few DROPS of water and giving it a good
stir - this will re-hydrate the ink
Retarder to the
ink - this will chemically extend the dying time and workability of the ink.
The Retarder is the better option, as it will pretty
much stop the ink drying, however the downside is that the prints can take
20-30 minutes to dry, so you cant heat set until the next day.
Elevate the screen ever so slightly so that is does not
stick to the fabric underneath - use
under the material to hold it still - and after printing look at the screen
to make sure it's clear of ink - if not then with the squeegee at almost
vertical print again.
This wont put ink through but will push the ink out of
the screen onto the fabric and keep the design clear.