To effectively waterproof a rain suit, you primarily need to restore or enhance its Durable Water Repellent (DWR) coating, which is crucial for making water bead up and roll off the fabric surface.
Understanding DWR and Its Importance
Most rain suits come treated with a DWR finish, which is a polymeric coating applied to the outer fabric. This coating prevents the fabric from "wetting out" (absorbing water), allowing the garment's breathable membrane (if present, like Gore-Tex) to function correctly. Over time, dirt, oils, abrasion, and repeated washing can degrade this DWR layer, causing water to soak into the fabric instead of beading up, making the suit feel "wet" and less effective.
Reapplying DWR: The Key to Waterproofing
Reapplying DWR is the most effective method to restore a rain suit's waterproofing capabilities. Your DWR can be reapplied via a spray-on or wash-in product that essentially coats all of the DWR "bald spots" on your rainwear. You can do this as many times as needed over the years.
Preparing Your Rain Suit
Before applying any DWR treatment, it's essential to clean your rain suit thoroughly. A clean surface allows the DWR to bond properly to the fabric.
- Wash the Suit: Use a technical gear wash specifically designed for waterproof breathable fabrics, or a mild liquid detergent. Avoid using powder detergents, fabric softeners, or bleach, as these can leave residues that hinder DWR performance.
- Gentle Cycle & Rinse: Wash on a gentle cycle with cold or warm water. Ensure an extra rinse cycle to remove all detergent residue.
- Inspect: After washing, ensure the suit is free from visible dirt or residues.
Choosing Your DWR Product
DWR replenishment products typically come in two main forms: wash-in and spray-on. Each has its advantages.
| DWR Product Type | Pros | Cons | Best For |
|---|---|---|---|
| Wash-In | Easy application; treats entire garment. | May coat inner lining, reducing breathability; less precise. | Garments without specific liners, or when full garment re-treatment is desired. |
| Spray-On | Targeted application; preserves inner lining; good for spot treatment. | Can be more labor-intensive; requires even application for best results. | Garments with breathable membranes (e.g., Gore-Tex) or when only specific areas need treatment. |
Application Steps
Follow the manufacturer's instructions for the type of DWR replenishment product you choose. General steps include:
For Wash-In Products:
- Preparation: Ensure your washing machine is clean and free of detergent residues.
- Add Product: Place the clean, damp (or dry, depending on product instructions) rain suit into the washing machine. Add the recommended amount of wash-in DWR product to the dispenser.
- Run Cycle: Run a gentle, warm wash cycle. Do not use an extra rinse cycle, as this will wash away the DWR.
- Dry: Tumble dry on a low heat setting, or air dry. Heat often helps to activate the DWR and improve its bond to the fabric.
For Spray-On Products:
- Preparation: Lay the clean, damp rain suit flat on a protected surface or hang it on a hanger.
- Spray Evenly: Hold the spray bottle 6-8 inches away from the fabric and apply an even coat over the entire outer surface of the rain suit. Pay special attention to high-wear areas like shoulders, elbows, and cuffs.
- Wipe Excess: Gently wipe off any excess drips or puddles with a clean cloth.
- Dry & Activate: Allow the suit to air dry completely. For best results, and to activate the DWR, tumble dry on a low-medium heat setting (check garment care tag) for 20-30 minutes, or iron on a low setting with a towel in between the iron and the fabric.
Maintaining Your Rain Suit's Waterproofing
To prolong the life of your DWR treatment and overall rain suit performance:
- Clean Regularly: Wash your rain suit periodically (every 10-12 uses or when it looks dirty) to remove dirt and oils that can impede DWR function.
- Avoid Contaminants: Try to avoid contact with insect repellents, sunscreens, and strong chemicals, as these can degrade the DWR.
- Proper Storage: Store your rain suit in a dry, well-ventilated area, away from direct sunlight.
By following these steps, you can effectively waterproof your rain suit and ensure it continues to provide reliable protection in wet conditions.
