Technical Tuesday-Printing on Performance Fabrics

Tis the season for spring and summer sports. We’ve all been there: you pull a crisp white print on a red polyester jersey off the dryer, only to watch it turn a dull, ghostly pink an hour later.

Dye migration is the ultimate buzzkill, but it isn’t a mystery—it’s physics. When polyester fibers get too hot, the dyes turn into a gas and sublimate right into your ink. If you want to keep your prints vibrant and your customers happy, you need a solid "low-heat" strategy.

1. Keep it Cool: Flash & Dryer Temps

The magic number for most polyester fabrics is 300°F (149°C). Once you cross that threshold, you’re inviting the dye to migrate.

Flash: Set your flash just long enough to skin the ink. If the garment is smoking, it’s too hot.
Dryer: Slow your belt speed down and lower the heat. It’s better to have a longer dwell time at a lower temperature than a "hot and fast" bake that ruins the shirt.

2. The Secret Weapon: Blocker Bases

Think of a blocker base as a physical shield. Before your color goes down, you need a high-quality barrier. We highly recommend Ink Tek’s Super Blocker Base. It’s formulated specifically to trap those pesky polyester dyes so they never reach your top colors.

3. Choose the Right White

Not all white inks are created equal. For performance wear, you need a "Low Cure" white that stays bright and creamy. Our top picks are:

International Coatings 7113 Unicorn White: Renowned for its matte finish and excellent "low-bleed" properties.
Monarch Yeti White: A shop favorite for its effortless shear and high opacity.

4. Mesh Counts: Lay it Thick

It’s tempting to use high mesh for detail, but on poly, volume is your friend. Using a lower mesh count like an 86 or 110 allows you to lay down a proper amount of ink to cover the fabric and prevent bleeding.

Pro Tip: A thicker ink deposit acts as a more substantial barrier. If the ink layer is too thin, the dye gas will eventually win the battle and seep through.

Quick Reference Guide

Blocker Base

86 - 110

Maximum barrier protection.

Low Cure White

110 - 156

High opacity and coverage.

Top Colors

156 - 180

Balance of detail and vibrancy.

Ready to upgrade your poly game? Keeping your heat low and your ink deposit high is the only way to ensure your prints look as good in a month as they do coming off the press today.