How To · Fashion · Outerwear Care
Waterproof and Reproof Your Outerwear Like a Pro
A quality jacket isn't waterproof forever—but restoring its protective coating is simpler than buying a replacement. Here's exactly how to reproof your outerwear and extend its lifespan.
5 min read · IrisWater resistance isn't permanent. Over time, washing, friction, and UV exposure wear down the hydrophobic coating on technical fabrics—which is why that expensive jacket starts soaking up rain instead of shedding it. The good news: reproofing is a straightforward maintenance task you can do at home, and it costs far less than dry cleaning or replacement.
Whether your outerwear is waxed cotton, Gore-Tex, or a synthetic blend, the reproof process follows the same logic: clean the fabric thoroughly, apply a fresh water-resistant treatment, and heat-set it. We'll walk you through each step so your jacket performs like new.
Water resistance isn't permanent—but restoring it takes less than an hour and costs under $40.
What you'll need.
- 01Technical fabric wash (Grangers, Nikwax, or equivalent)
- 02Reproof treatment—wash-in or spray (Nikwax, Grangers, Fibreplex, or brand-specific products)
- 03Soft brush or lint roller
- 04Washing machine or sink
- 05Dryer or low-heat iron
- 06Clean pressing cloth (if ironing)
- 07Fabric repair kit (if needed for pre-existing damage)
Step one · 5 minutes
Inspect your jacket for damage
Before you invest time and product, check for rips, seam separation, or worn spots. Small holes won't be sealed by reproof treatment—you'll need to patch those first with a fabric repair kit or take the jacket to a tailor. Look closely at high-friction areas like cuffs, collar edges, and pocket openings. If the fabric is pilling or fraying, a gentle lint roller or soft brush will help the treatment adhere evenly.
Reproof won't fix structural damage. Address tears or seam issues before proceeding.
Step two · 10 minutes
Wash the jacket properly
Use cool water and a gentle cycle with a technical fabric wash (brands like Grangers or Nikwax make purpose-built cleaners). Avoid regular detergent, which leaves residue that blocks water-resistant treatments. If your jacket is heavily soiled, hand-wash the dirtiest areas first with a soft brush and diluted technical wash. Rinse thoroughly until the water runs clear—any soap film will interfere with reproof adhesion.
Never use fabric softener or bleach. Both degrade water-resistant coatings.
Step three · 5 minutes
Dry the jacket completely
Spin out excess water gently, then hang or lay flat to air-dry in a warm space. If you have access to a dryer, use low heat for 15–20 minutes to speed drying—this also helps open the fabric's pores. The jacket must be completely dry before reproof treatment, or the product won't bond properly. Check seams and inside pockets, which trap moisture longer than the outer shell.
A barely damp jacket will still accept reproof, but fully dry fabric gives the best results.
Step four · 10 minutes
Apply the reproof treatment
Choose between wash-in treatments (added to the rinse cycle) or spray-on products. Wash-in treatments are more thorough and work on all fabric types; spray-on options are faster but suit lightweight jackets better. Follow the product instructions exactly—most wash-in treatments require a specific water temperature and dwell time. If spraying, apply in thin, even coats in a well-ventilated space, holding the can 6–8 inches away. Avoid over-saturating, which creates stiff patches.
Wash-in reproof is more reliable for structured outerwear like parkas and wool coats.
Step five · 10 minutes
Heat-set the treatment
Most reproof products activate with heat. Toss the jacket in the dryer on low or medium heat for 15–20 minutes, or use a warm iron on the lowest synthetic setting, holding it 2–3 inches above the fabric without touching directly. The heat reactivates the water-resistant coating and helps it bond to the fibers. You'll notice the fabric may feel slightly stiffer immediately after—this is normal and softens with wear.
Don't skip heat-setting. It's what makes the reproof actually work.
Step six · 5 minutes
Test water beading
Once the jacket is cool, sprinkle a few drops of water on the outer shell. If they bead up and roll off, your reproof worked. If water soaks in or spreads flat, the treatment didn't adhere properly—usually because the fabric wasn't fully dry before application or the heat-setting was incomplete. In that case, wait 24 hours and repeat the heat-setting step, or reapply the treatment if necessary.
Water beading is your confirmation. No beading means the reproof didn't take.
How to know your reproof worked
The most reliable test is the water-bead check: droplets should sit on the surface and roll off rather than soak in. Your jacket should also feel slightly less soft than before reproof—this stiffness fades after a few wears. If water still penetrates after 24 hours, the treatment didn't bond properly, and you'll need to repeat the heat-setting or reapply.
Questions at the mirror.
Can I reproof a jacket with a down or synthetic lining?
Yes. Reproof treatments work on the outer shell only. Avoid getting excess product on the lining during application. If using a spray treatment, mask off the lining with newspaper before spraying.
My jacket still leaks after reproof. What went wrong?
Most likely causes: incomplete drying before treatment, insufficient heat-setting, or pre-existing damage to seams or fabric. Check for small holes or seam separation and repair those first. If the shell is intact, repeat the heat-setting step—sometimes one cycle isn't enough.
How often should I reproof my jacket?
Every 1–2 years with regular wear, or whenever water stops beading on the surface. Heavy use or frequent washing may require reproof every season. Light-use jackets can go 2–3 years between treatments.
Is wash-in reproof better than spray?
Wash-in treatments are more thorough and work better on structured outerwear and seams. Spray is faster and suits lightweight shells. For best results on technical jackets, choose wash-in.
Can I reproof a waxed cotton jacket?
Waxed cotton has a built-in water-resistant finish. You can reproof it, but first test a hidden area—some wax finishes don't bond well with modern reproof products. If unsure, consult the jacket's care label or contact the brand.