Best DWR reapplication for a Gore-Tex shell?
Revitalizing Your Gore-Tex: The Ultimate Guide to DWR Reapplication
Your Gore-Tex shell is an investment in staying dry and comfortable during your outdoor adventures. While Gore-Tex fabric itself is waterproof, its performance relies heavily on the Durable Water Repellent (DWR) coating on its exterior. This DWR causes water to bead up and roll off, preventing the fabric from ‘wetting out’ – a phenomenon where the outer layer becomes saturated, making your jacket feel heavy and clammy, even if the Gore-Tex membrane is still keeping water out.
Understanding DWR and Its Importance
DWR is a polymeric coating applied to the outer fabric of waterproof-breathable garments. It creates a high surface tension that forces water droplets to bead up rather than soak into the fabric. Over time, dirt, body oils, insect repellent, and repeated washing can degrade this coating, reducing its effectiveness. When the DWR fails, the fabric absorbs water, which can hinder the breathability of your Gore-Tex membrane, as the saturated outer layer blocks the vapor transfer.
Signs Your DWR Needs Reapplication
The clearest sign that your DWR needs a refresh is when your jacket starts to ‘wet out.’ Instead of water beading and rolling off, it will spread and soak into the outer fabric, making it appear darker. Don’t confuse this with the jacket leaking; the Gore-Tex membrane still provides waterproof protection. However, a saturated outer fabric feels colder, heavier, and significantly reduces the garment’s breathability, diminishing your comfort. A simple ‘spray test’ with a water bottle can quickly show if water beads or soaks in.
The Essential First Step: Cleaning Your Shell
Before applying any DWR treatment, your Gore-Tex shell must be clean. Often, a thorough wash with a technical cleaner designed for waterproof breathable fabrics can revive a partially clogged DWR. These cleaners (like Nikwax Tech Wash or Grangers Performance Wash) remove dirt, oils, and residues without leaving behind water-attracting (hydrophilic) contaminants that can inhibit DWR function. Always follow the garment’s care label and the cleaner’s instructions.
Choosing the Best DWR Reapplication Product
There are two main types of DWR reapplication products: wash-in and spray-on. For Gore-Tex shells, spray-on treatments are generally recommended because they only treat the exterior fabric, preserving the garment’s internal wicking properties (if it has them). Wash-in treatments can coat the inside of the jacket, potentially affecting moisture management of internal linings or insulation. However, for a simple hardshell with no internal wicking components, a wash-in can be convenient.
Top DWR Reapplication Products:
- Nikwax TX.Direct Spray-On: A popular and highly effective choice. It’s water-based, doesn’t require heat activation, and is easy to apply.
- Grangers Performance Repel Plus Spray: Another excellent water-based option that uses fluorocarbon-free technology. Often benefits from heat activation.
- Gear Aid Revivex Durable Water Repellent Spray: A good choice, often requiring heat activation for optimal performance. Comes in both fluorocarbon and PFC-free versions.
Step-by-Step Spray-On DWR Application
Once your shell is clean and free of residues, follow these steps for a successful spray-on reapplication:
- Prepare Your Workspace: Work in a well-ventilated area, preferably outdoors or in a garage. Protect surfaces from overspray.
- Damp or Dry? Some products, like Nikwax, work best on a damp (but not dripping) garment. Others, like Grangers or Gear Aid, can be applied to a dry garment. Always check the product instructions.
- Apply Evenly: Lay your jacket flat or hang it on a hanger. Spray the DWR treatment evenly over the entire exterior surface from about 6-8 inches away. Pay special attention to high-wear areas like shoulders, cuffs, and collar. Avoid oversaturating.
- Wipe Off Excess: Immediately wipe away any drips or puddles with a clean, damp cloth. This prevents streaks and ensures even coverage.
- Heat Activation (If Required): For many DWR products, gentle heat activation is key to bonding the DWR to the fabric. You can achieve this by tumble drying on a low or medium heat setting (refer to your jacket’s care label and product instructions), or by carefully ironing on a low setting with a towel between the iron and the fabric. If the product is water-based and says it doesn’t need heat (like Nikwax), you can skip this step.
- Air Dry: Allow the jacket to fully air dry before use or storage.
Tips for Longevity and Performance
- Regular Cleaning: Don’t wait for your DWR to completely fail. Regular cleaning with a technical wash will help maintain the DWR and the fabric’s breathability.
- Avoid Fabric Softeners: Never use fabric softeners or conventional detergents, as they can leave residues that compromise DWR and the waterproof membrane.
- Gentle Care: Wash your jacket according to its care label, typically on a gentle cycle with cold or warm water.
- Storage: Store your shell in a dry, well-ventilated area, away from direct sunlight.
Conclusion
Reapplying the DWR to your Gore-Tex shell is a simple yet vital maintenance task that will significantly extend the life and performance of your gear. By following these steps and using a quality spray-on product, you’ll ensure your jacket continues to shed water effectively, allowing the Gore-Tex membrane to breathe and keeping you comfortable and dry on all your adventures. A well-maintained shell is a happy shell, ready for whatever the weather throws your way.
