Pre-treating a T-shirt with a Roller

To prevent colored T-shirt fibers on the roller from sticking to other T-shirts, use a different roller for each color.

Note: Apply approximately 0.5 ounces (15 grams) of pre-treatment solution to printing areas of letter-/A4-size. Do not apply too much pre-treatment liquid; otherwise, the print quality may decline. Depending on the properties of the T-shirt material, traces of the pre-treatment solution may be visible after fixing the ink if the solution was applied using a roller. If this happens, try applying the pre-treatment solution with a machine instead.

Fill the tray with diluted pre-treatment solution and dip the roller in it.
Spread out the T-shirt on a flat surface.
Use sticky tape (or a lint roller) to remove lint from the area where you will apply the pre-treatment solution.
Squeeze the pre-treatment solution out of the roller by pressing it against the edge of the tray.
Apply the solution evenly in both directions as shown to an area larger than the target print area. It is important to finish in the shoulder-to-shoulder direction; this aligns the fabric fibers to the direction of the print head movement.
Fix the pre-treatment solution with a heat press and parchment (silicone) paper.
Note: The T-shirt fibers must be pressed flat to produce even whiteness. Even if you use a heat tunnel to fix the ink, use a heat press with parchment (silicone) paper to fix the pre-treatment solution before printing.