Velocity Systems

Blast From The Past – Revitalizing Your DWR

We originally published this article in February of 2010 but seeing as the weather is getting cold and times are tough we republish it each year. We know you pay a lot for your clothing and equipment and it is just as important to maintain it, as it is your firearm.

It looks like it’s going to be a LONG winter. During a recent shooting class I attended it started raining day one and by the middle of the second day it looked like a blizzard. Most of my fellow shooters were wearing waterproof breathable outerwear and several began to feel clammy and then damp the longer each day progressed. A couple of guys were wearing issue Gen I ECWCS parkas. Probably not the best garment available as Gore long ago decided that the basic design could not meet their “Guaranteed to Keep You Dry” standards. Of course these jackets were old. More than anything, they needed some maintenance.

The key to any modern outerwear is its Durable Water Repellent (DWR). There are quite a few treatments available and different manufacturers have their favorites but they are usually are based on flouropolymers. These are PTFE molecules that are applied to the surface and cured at high heat to make them adhere better and increase performance and have a fluorine atom at one end which is highly hydrophobic. Heat causes them to align themselves with their flourines exposed. Water tries to move away from the flourines resulting in beading. This allows the water to roll off without wetting the fabric. Interestingly, Quarpel (Quartermaster Repellent) was one of the first DWRs and used to treat field jackets and other military clothing items.

Since most of us can’t run out and purchase a new jacket every time this happens I thought it would be a good idea to share a few tips with you that will not only revitalize your garment’s DWR treatment but also extend the life of your clothing.

DWR treatments work best when they are clean. I realize this seems counter to what you think is right since a DWR generally lasts about 25 washings and tactical garments get quite a beating in the field, but you need to wash your clothing. The first thing is to avoid using liquid detergents as well as fabric softeners. Additionally, avoid optical brighteners as they are not good for DWR or IR treatments. There are wash in treatments you can purchase as well as spray on options to help renew your clothing’s DWR. However, wash in treatments may affect the breathability of your membrane. One of the best spray solutions available is Revivex from McNett and it is what I have used in the past. It also serves as a stain repellent. Revivex can also be applied to garments that never had DWR in the first place so if you have hunting or field clothing that you find yourself wearing in inclement weather regularly you may want to give it a once over. If you use a spray treatment be sure to evenly coat your garment while it is still damp after washing and to pay special attention to any seams.

There are two additional ways you can put some life back into your DWR. One is to put the garment in a conventional dryer on warm and the other is to iron it on low heat. If water fails to bead up on the surface of your garment you will need to retreat.

No matter which method you choose, proper maintenance of your foul weather clothing’s DWR will help keep you warm and dry and extend the life of your equipment.

6 Responses to “Blast From The Past – Revitalizing Your DWR”

  1. Timmay says:

    Good article, and timely, it’s been pissing, foggy or outright dumping here(GA) for most of a week and my old Gen one GI Goretex needs some help. I’d like to hear some products and or tips to bring it back up to speed.

    No, trashing it and spending $600 on the latest Tier One approved astronaut gear is NOT an option at the moment.

    • Lasse says:

      Read the article you just commented in, it includes a LOT of examples. Even a few free ones if you have a dryer or an iron.

      SSD; Thanks for posting this again.

  2. bob says:

    I do this every fall when the weather gets soggy. Usually a quick rinse in the washer, and then a warm dryer are enough to bring a WPB jacket back to life. I have had good success with Nikwax Tech-Wash and wash-in DWR when that doesn’t work.

  3. Black6ID says:

    Good reminder there SSD. Was wanting to try Rustoleums new product “Never Wet”. 2 part process and from the videos it looks like it can be applied to literally any surface. Any knowledge?

    • WB says:

      Ditto on Rustoleum Never Wet- looks awesome, though I frankly have cancer/medical concerns for having such a hydrophobic material so close to my skin/respiration and for as much time as a jacket would be worn. Anybody got any additional info?

  4. redbeard33 says:

    Durable Water-Repellent: 2 lies in 3 words!