Why do you ALWAYS want to use off contact, and at what spacing do you use for this method?On-Contact is when you have the screen touching the substrate (the t-shirt). Off-Contact is when you leave space between the screen and the substrate. You ALWAYS want to use Off-Contact.
Flooding the screen is pushing the ink with the squeegee through the screen before doing an actual print. It gets the ink lined up in the screen for you to print, and can keep your ink from drying in the screen if you are using waterbased ink. Hope this helps.