The RushDTF Team · Updated 2026-09-06 · 8 min read
Polyester and nylon are where most DTF mistakes happen. Here's how to press them so the print stays true and the fabric stays intact.
Polyester and nylon are two of the biggest reasons shops move to DTF in the first place — sports jerseys, athletic wear, backpacks, jackets — and they're also where most of the pressing complaints come from. The chemistry is different from cotton, and pressing them like a t-shirt is how you end up with a discoloured logo two days after a customer picks up their order.
Cotton is a natural fibre with a high scorch point and no dye that moves once it's set. Polyester and nylon are synthetic, melt at relatively low temperatures, and — critically for polyester — are often dyed with disperse dyes that were never designed to sit still under 300°F+ heat. Nylon adds a second problem on top of that: it's a slick, low-surface-energy fibre that adhesives don't grab onto as readily as they grab cotton.
Dye migration is disperse dye in the polyester fabric turning to gas under heat and travelling up through the DTF adhesive and white ink layer, then re-solidifying as it cools. The result shows up as a pink, red or purple tint bleeding into what should be a white or light-coloured print — sometimes visible right off the press, more often appearing 24–48 hours later as the dye continues to migrate after the heat is gone.
If a print looks perfect coming off the press and then develops a pink or red cast over the next day or two, that's migration, not a bad transfer. It's a heat and fabric problem, not a print quality problem.
The fix is straightforward: press cooler and longer instead of hot and fast. On 100% polyester, drop to 260–265°F and extend the press to 10 seconds instead of the standard 8. On performance and moisture-wicking blends, go as low as 255–260°F. The lower peak temperature gives the disperse dye less energy to migrate while the extra couple of seconds still gives the adhesive time to reach full melt and bond properly.
| Fabric | Temp | Time | Peel |
|---|---|---|---|
| Light-coloured polyester | 270°F | 8–10 sec | Warm |
| Dark / saturated polyester | 260°F | 10 sec | Warm |
| Performance / moisture-wicking | 255–260°F | 10 sec | Warm |
| Nylon (any colour) | 250°F | 12–14 sec | Cold |
It's also worth using medium or medium-light pressure rather than heavy pressure on polyester — hard pressure pushes more heat through to the dye layer for the same temperature reading, and it's one more variable pushing you toward migration on marginal fabric.
For very dark, very saturated polyester where you're worried even a careful low-temp press won't be enough — think deep maroon or true red athletic jerseys — a thin heat-resistant barrier sheet between the garment and the platen (not on the print side) can shave a few extra degrees of direct heat transfer without changing your press settings. It's not a substitute for correct temperature, but it's a reasonable extra layer of insurance on a customer's expensive team jerseys.
Nylon's issue isn't usually dye migration — it's adhesion and heat damage. Push nylon too hot and you'll see the fabric itself go glossy, stiff or slightly puckered around the print before the adhesive even fully sets. Because nylon is so heat-sensitive, the fix is the opposite direction from polyester dye migration: go lower on temperature (250°F) and compensate with more time (12–14 seconds) and lighter, even pressure. Always cold peel nylon — pulling the film while it's still warm is the single most common cause of edges lifting on jacket and windbreaker orders.
Ripstop and coated nylon (the kind used on rain jackets and some backpacks) can have a water-repellent finish that also repels the adhesive. A 3–5 second pre-press specifically to knock down surface finish, followed by the standard press, meaningfully improves bond strength on these fabrics.
Migration is a delayed reaction. A print can look perfect the moment it comes off the press and still develop discolouration a day later. Build the 24–48 hour check into your process for any new dark polyester blank, especially one you haven't run before.
Our white underbase and adhesive are dialled in for cotton through nylon. Gang your jersey names and numbers onto one sheet and we'll ship from Regina in 1–2 business days.
Yes. Press cooler than you would cotton — around 260–265°F for 10 seconds — to avoid dye migration, especially on dark or saturated colours like red and navy.
That's dye migration. Disperse dye in the polyester travelled through the adhesive under too much heat and re-set as a pink or red tint. Lower your press temperature and extend the time slightly on future prints of that fabric.
Yes, but nylon needs its own settings: around 250°F for 12–14 seconds with light, even pressure and a cold peel. Nylon melts and glazes at temperatures cotton would handle easily.
It can appear immediately, but more often develops over 24 to 48 hours as residual heat continues pushing dye through the print layer. Always check a test press a day or two later before running a full order.
Warm peel is standard on most polyester. Nylon is the exception — always cold peel nylon to avoid the film lifting at the edges before the adhesive fully sets.
You can reduce the risk significantly with lower temperatures, lighter pressure and a barrier sheet on the darkest fabrics, but some cheap, poorly dyed polyester blanks will migrate no matter how careful the press settings are. Test before committing to a full order.