How to Reproof a Waterproof Jacket (Wash-In Method)

If your jacket soaks through at the shoulders while the rest still beads, the membrane is fine and the outer coating has failed. This is the most satisfying repair in outdoor gear because it costs a few pounds, takes twenty minutes of actual work, and reverses what looked like the end of a jacket.

First, confirm it is wetting out

Waterproof jackets leak in three ways, and only one is fixed by reproofing:

• Wetting out — fabric darkens and absorbs water. Fix: reproof. This is the common one.
• Leaking seams — water enters at stitch lines. Fix: seam sealant, or a warranty repair.
• Leaking through the membrane — rare, usually a genuine manufacturing fault. Fix: warranty claim.

Wetting out is easy to spot: a large dark patch on the shoulders or hood that stays wet while other areas still form beads.

Why it happens

DWR works by making the face fabric so water-repellent that droplets sit on top rather than soaking in. Body oils, dirt, sunscreen and abrasion all break that down. The jacket is still waterproof underneath — you just cannot get rid of the water, so it feels wet and clammy, and breathability drops sharply because the saturated outer layer blocks vapour escape.

The wash-in method, step by step

1. Empty every pocket and close all zips and velcro straps. Loose items will damage both the drum and the jacket.
2. Wash on a gentle cycle at 30°C with a dedicated technical cleaner, not regular detergent. Detergent leaves a surfactant residue that coats the membrane and reduces breathability.
3. Run a second rinse cycle if your machine adds it automatically — residue is the enemy here.
4. Add the wash-in water repellent in place of softener, at the dose on the bottle. It is usually a two-bottle process: clean first, then treat. Many products combine both.
5. Dry on low heat or tumble briefly. Heat activates the treatment. Follow the label — too much heat damages the membrane, none at all leaves the DWR inactive.
6. Test with a sprinkler. If water does not bead within an hour of drying, repeat the treatment step.

What if it still does not bead?

Two likely causes. Either the jacket was not clean enough before treating — body oil will stop any DWR from bonding — so wash it again properly first. Or the DWR was applied to a saturated face fabric, in which case you need to dry it fully and treat again.

Spray-on treatments are worth considering when only one area has failed, because wash-in treats the whole garment including the inside of the hood and the shoulders under pack straps.

Extending the life of the treatment

• Wash the jacket before it looks bad, not after. Body oil builds up invisibly.
• Never use fabric softener or detergent with added conditioner.
• Retreat after roughly ten washes, or whenever beading starts to fade.
• Store dry. A damp jacket in a stuff sack degrades DWR fastest.

What to use

Wash-in products from established brands do the job reliably — Nikwax and similar wash-in proofers are the usual choices, and a bottle treats several jackets. We list our regular partners in the gear comparison box on every review, with full disclosure on how affiliate links work in our about page.

When reproofing is not worth it

If the face fabric is delaminating, the seam tape is peeling in several places, or the zip is failing, the jacket is genuinely finished. In that case a repair-first replacement such as a second-hand premium shell is the better buy. We cover how to judge that in resole or replace, which applies the same test to boots.

The takeaway

Dirty fabric kills DWR long before the membrane fails. A thirty-degree wash with the right cleaner and a heat activation step restores most jackets that people assume are dead. It is the cheapest gear upgrade you will make all year.

Wash-in, spray-on or wash-in plus top-up

Method	Best for	Coverage
Wash-in	General retreatment of a whole jacket	Even, including seams and shoulders
Spray-on	One worn patch, or a jacket with taped zones you want untouched	Precise, needs masking off
Combined wash-in + top-up	Heavily used kit, or anything that failed last time	Full coverage plus targeted reinforcement

Wash-in is the right default because it treats the areas that fail first — shoulders, hood and under pack straps — without you having to reach them.

How often should you reproof?

Treat it as a twice-a-year job for a jacket worn regularly, and always reproof after about ten washes. The practical signal is simpler than a schedule: if water stops forming tight beads after drying, it is time.

What reproofing will not fix

• Delamination — if the inner coating is flaking, the fabric is finished.
• Failed seam tape peeling in several places.
• Damaged hardware — broken zips, missing pullers, jammed hood cinches.

In those cases the repair-first move is a used premium shell rather than a new mid-range one, which keeps good gear in circulation and usually costs less. The same judgement call applies to footwear in resole or replace.