Why sublimation on polyester is so strong (and why it sometimes goes wrong anyway)

Sublimation is often the "premium" choice for sportswear and polyester applications: the print feels almost non-existent, remains colorfast for a long time when used correctly, and doesn't crack like some films can. Still, sublimation in production can be quite frustrating. You press one sample perfectly, and on the next you have ghosting, dull colors or unexpected hues.

This guide focuses on what really matters for consistent sublimation: material rules (polyester percentage, fabric color), setting ranges (temperature/time/print), a checklist to avoid ghosting, and how to manage color expectations so customers (or your team) don't experience "black = gray" or "red = fuchsia."

We keep it practical and brand-independent: you'll learn a testing method that works whether you're in a sports club, print studio or small merch setup.

Material rules: polyester percentage, fabric color and coatings

Polyester percentage

The higher the polyester content, the better the color usually "picks up. At low percentages, you often get a vintage/washed effect. This may be desirable, but talk it down.

Fabric color: why white or light is almost mandatory

Sublimation does not add white ink. Anything that has to be "white" in your design is in fact the color of the fabric. So on dark textiles, you will never get true coverage.

Coatings (for hardgoods).

For mugs, plates or other hardgoods, a polymer coating is required. Without a coating, the color will not fade or adhere correctly.

Practical check before you start

• Is the shirt white/light?
• Does it feel like sports polyester (smooth, synthetic)?
• Is the label/description clear about polyester percentage?

If any of those three are questionable, schedule a test press and explicitly state the expectation of color and coverage.

Settings, preventing ghosting and managing color expectations

Settings: temperature, time and pressure

As with DTF, we work with ranges.

• Temperature: high enough for the dye to transfer, but not so high that the fabric shines.
• Time: long enough for full transfer, but not so long that details "bleed.
• Pressure: usually light to medium; too much pressure can cause paper to shift or distort fabric.

Why ranges. Because paper, ink and fabric coating affect the process.

Preventing ghosting (checklist).

Ghosting is almost always movement: paper shifting when closing or opening.

Practical measures:

• Fix paper with heat-resistant tape.
• Work with a non-slip carpet pad or press pad that does not "jump".
• Open the press in a controlled manner: no jerking motion.
• Allow to stabilize briefly before removing paper.

Color expectations & design

Screen vs fabric

What you see on a backlit screen is not what you get on fabric. Fabric reflects differently and has texture.

'Black' on sublimation

Sublimation has no white undercoat and works on light polyester. 'Deep black' can look dark gray depending on ink set, profile and material. Communicate that up front.

Design decisions that help

• Avoid super-light shades on just-not-white polyester: they disappear.
• Use contrast and test a color swatch.

When better to use DTF or flex?

• Dark cotton → sublimation drops out; DTF or flex.
• Names/numbers (1 color) → flex is fast and tight.
• Full color on cotton/blend → DTF is often most practical.

The gain is in process discipline: positioning, fixing, controlled opening, and color expectation framing in advance.

FAQ: Sublimation on polyester