DWR products change the electrical potential of the surface area of the outer fabric of your ski jacket so that water is not attracted to it. When properly applied, water will bead and roll off instead of sticking, wetting out, or saturating the fabric. If water is no longer beading up on the outer surface of your jacket, it is time to refresh or re-apply the DWR.
To refresh the DWR, the first step is washing. Dirt, oil, grease, smoke, sap etc. will degrade the performance of the DWR. Often, simply washing your jacket, rinsing well and tumble-drying on medium heat for 30 minutes can revive the factory DWR. When washing no longer revives the DWR, it is time to reapply the finish.
Over time, the DWR will wear away. Dirt will wear away the finish. Abrasion will also wear away the DWR. Common areas of abrasion include sleeves, shoulders and areas under pack straps. Once the DWR is worn away, re-application will restore the original performance of the fabric.
To re-waterproof your ski jacket, use one of the widely available spray-on or wash-in DWR treatments for waterproof/breathable garments. While wash-in treatments are easier to use, they tend to be less effective than spray-on treatments. If your jacket is insulated or has a hanging mesh liner you will probably want to use a spray-on product. Wash-in treatments will also wash into your jacket`s liner thereby preventing it from wicking.
After either treatment, tumble-dry your jacket for at least a half hour on medium heat. The application of heat is a critical element in activating the DWR properties of the treatment. All of the aftemarket treatments for re-waterproofing your jacket recommend that some form of heat be applied to the garment after it is treated - either tumble dry or line dry and then iron.
Once you have successfully cleaned and refinished your ski jacket, it will work like new again.
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