AC-310 Silkscreen Medium is a thickening agent that, when added to Stroke & Coat®, Designer Liner or Underglazes, creates a "ceramic paste" that is suitable to be used in silk screen processes.
Prepare the Color Paste:
Dispense a 1" wide dollop of glaze onto a plate or palette. Sprinkle a pinch of AC-310 Silk Screen Medium over the glaze and allow to sit for 10-15 seconds. Mix together using a palette knife until the mixture is smooth and contains no lumps. The final consistency should be similar to a smooth peanut butter. If mixture is still too thin, sparingly add a bit more Silk Screen Medium to thicken; if mixture is too thick add a small amount of glaze. Remix and adjust as needed.
Then you are able to apply to your silk screens!
For more help see this great Mayco video