Water Repellent for Polyester: Choosing and Applying the Right Finish

A water repellent for polyester is one of the most common finishes in textiles, because polyester is the most widely used fibre and takes a durable water repellent readily. Polyester is naturally hydrophobic, tolerates a full cure, and holds a high spray rating — so the main decisions are the chemistry and protecting the fabric’s colour and hand during finishing. This guide covers choosing and applying a water repellent for polyester.

For the basics, see our durable water repellent overview and C6 vs C0 water repellents.

Why polyester suits a water repellent

Polyester’s surface is already water-shedding, so a DWR builds on a good base and reaches a high spray rating with a soft hand. It also withstands the 150–170 °C cure that bonds the finish, which makes durable results straightforward.

C0 or C6 for polyester?

For sportswear, home textiles and most apparel, a fluorine-free C0 finish is the default — full water repellency, PFAS-free. Use a C6 only where oil and stain repellency is genuinely needed; see C6 vs C0.

Application and cure

Polyester is finished by pad-dry-cure and handles a full cure well. One thing to watch on deep-dyed polyester: disperse dyes can migrate or sublime at high cure temperatures, shifting the shade. Confirm the cure window against the fabric’s dye, and test on production cloth before scaling.

Softness, colour and durability

The right grade at the right pick-up keeps polyester soft and breathable; over-application is what stiffens it. Use the recommended crosslinker and a full cure for wash durability — see wash-durable water repellency — and check results against the spray-rating scale in water repellency ratings.

Where polyester water repellents are used

• Sportswear and activewear, including polyester-spandex blends, which need a lower cure.
• Home textiles: curtains, cushions and upholstery.
• Technical and industrial fabrics — see technical textiles.

Get a polyester grade

DWR Factory supplies water repellents for polyester in C0 and C6, water- and solvent-based, with OEKO-TEX-compliant options and a TDS per grade. Tell us your fabric and target and we will recommend one: request a free sample or browse the range.

Frequently asked questions

What is the best water repellent for polyester?

A fluorine-free C0 grade suits most polyester — high spray rating, soft hand, PFAS-free. Use C6 only if oil repellency is needed.

How do you make polyester water repellent?

Apply a DWR by pad-dry-cure with a crosslinker, then cure at 150 to 170 °C, which polyester tolerates well.

Does finishing change the colour of dyed polyester?

It can — disperse dyes may migrate at high cure temperatures. Confirm the cure window and test on production cloth first.

Is a polyester water repellent wash durable?

Yes. With a crosslinker and a proper cure a polyester finish survives many wash cycles.

Can polyester-spandex blends be treated?

Yes, but use a lower-temperature cure so the elastane is not damaged.