Waterproof renewal

If you’ve discovered that your rain jacket isn’t as waterproof as it used to be, you can rehabilitate the waterproofing.

Rain coming on Friday

Wash and dry to refresh existing coatings

Most rainwear have a Durable Water Repellent (DWR) coating to keep water from fully penetrating your jacket’s exterior. High tech membranes such as GoreTex remain waterproof, but the water repellent in your shell can and does wear out.

I continue to use and recommend the spray-on and wash-in products from NikWax to renew the water repelling properties.

First, wash your rain gear in a cleaner such as Nikwax Tech Wash, which is specifically designed to enhance DWR coatings. Nikwax claims that standard laundry detergents leave hydrophilic (or water attracting) residues in your apparel. The result: Your jacket and rain paints absorb water. Using a product like Tech Wash removes these detergent residues.

Tech Wash is pricey stuff. The MSDS for Tech Wash says it’s made of “potassium soaps and additives,” so I imagine many non-detergent laundry soaps should be fairly safe for your water repellent coating. Your mileage may vary, buyer beware, etc. Some laundry cleaners popular with athletes such as Sports Suds are, in fact, detergents, but some people report good results with the various “sports wash” detergents that claim to be residue free.

The Peloton Stage 1

After that, some DWR coatings can be ‘refreshed’ by simply tossing it into the dryer. The heat of the dryer reactivates the water repellent property of the fabric. (Note: Read your fabric care instructions – not all materials are the same in this regard.)

Add-in water repellents

If washing and cleaning isn’t enough, Nikwax makes replacement DWR coatings. For the hardshell rain jackets many of us in the Bay Area use, Nikwax says to use TX Direct Wash. You pour TX Direct Wash into the wash with your raingear.

Softshell jackets and other apparel are treated with Nikwax Softshell Proof.

NikWax products are biodegradable, water based and non-toxic unless you ingest large quantities, so don’t do that.

This stuff works. If you’re skeptical, NikWax North America offers a free Gear Rehab Service. Send in once piece of wearable gear, and NikWax will clean and refresh the waterproofing on it for free. There are limitations and provisos so read the rules, but it’s a rocking deal. NikWax had a free “Gear Rehab Service” to try before you buy for several years, but that program seems to be cancelled for 2015.


  1. A couple of years ago, my wife bought me a ‘Portland’ jacket from Showers Pass – I thought that it was extravagantly expensive, but she pointed out that the cost was ‘a couple of tanks of gas’. Jacket has been wonderful, warm, dry, stylish.

  2. Can you clarify where the free one-piece offer is? That link went to their page, that just seems to show what products to buy.

    I’ve always thought Nikwax was a bit of a scam. I wouldn’t be surprised if all their various bottles are simply non-detergent soaps and water, and not much different from most liquid soaps. I wash all my gear in Dr. Bronners liquid castille soaps, which aren’t necessarily dirt cheap either, but are much better than a single purpose bottle, and I use it for many uses too.

    And +1 for Showers Pass. I don’t like their <$200 models, as I found them more the clammy material and cut way too huge for riding (flapping in the wind), but the Elite versions are fabulous. I even bought a second a few years ago, expecting my original one to fall apart someday, but I'm still on jacket #1 after 300+ days of use.

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