Sooner or later, every outdoor enthusiast asks themselves: "How do I make my rain jacket waterproof again?" At the latest when the clothes underneath get damp, a quick and sustainable solution is needed. In this article, we show you waterproofing a rain jacket made easy: incl. instructions – step by step, with all important tips and tricks. This way you save costs in the long run, conserve valuable resources and significantly extend the lifespan of your outdoor clothing. Because: a well-maintained rain jacket can be a reliable companion for many years.
What does waterproofing actually mean?
Before we look at how to properly treat your clothing, it's worth examining the basics. Simply put, waterproofing ensures that water beads off your jacket instead of penetrating it. With frequent use, the wind and moisture protection of hardshell jackets and pants diminishes. Friction, dirt, sweat and UV radiation attack the protective DWR layer (Durable Water Repellent).
To ensure lasting protection, you should therefore maintain your clothing regularly and re-waterproof it. Similar to properly caring for merino wool, the principle is: those who treat their functional clothing well will enjoy it for a long time.
How can I tell if the waterproofing is still working?
You can tell whether the waterproofing is still doing its job by checking the moisture protection. Normally, water droplets bead off your hardshell jacket and simply run down the fabric. This keeps you comfortably dry.
But it's not just waterproofness that matters – breathability also depends directly on the waterproofing. When you sweat during hiking or climbing, water vapor forms. With a good hardshell jacket, this can escape to the outside through the membrane and ensures pleasant body climate.
If the waterproofing is insufficient, a film of water forms on the outside. The water vapor remains trapped inside, the jacket sticks to your body and you feel clammy. This is simply because breathability only works if the fabric stays dry on the outside. By now you should definitely take action. Anyone on longer tours – such as with an ultralight backpack for winter tours – is particularly dependent on reliably water-repellent clothing.
Waterproofing a rain jacket made easy: incl. instructions step by step
As is often the case in life, there is no one single solution. We present you with the most common methods to reliably make your rain jacket waterproof again.
Option 1: With waterproofing spray
Waterproofing spray is suitable for all jackets regardless of model – whether rain jacket or winter jacket. Here's how to proceed:
- Preparation: Close all zippers and wash your jacket according to the care label. Only clean clothing can be waterproofed properly – dirt, dust and grease prevent effectiveness.
- Check the label: Some sprays are applied to damp fabric, others to dry fabric. It's worth checking the instructions.
- Spray outdoors: Hang the jacket on a hanger and choose a sheltered spot outdoors. This way you won't inhale the spray.
- Apply evenly: Spray the outside evenly. Don't forget heavily stressed areas such as shoulders, seams, pockets, zippers, back and hood.
- Let it work: After a few minutes, remove excess spray with a clean cloth so no stains remain.
- Dry: Let the jacket air dry – unless the spray requires heat activation in the dryer or with an iron.
Option 2: With wash-in waterproofing
For heavily stressed jackets, waterproofing in the washing machine is often more effective because the product fully penetrates the fabric. Important: The wash drum should be free of residue beforehand, as leftover detergent reduces effectiveness. The liquid waterproofing agent goes into the detergent compartment, then wash on a gentle cycle.
Option 3: Activation through heat
Many modern waterproofing products develop their full effectiveness only through heat. A brief cycle in the dryer (if the care label permits) or careful ironing at low temperature with an ironing cloth noticeably reactivates the DWR layer.
Tips for long-lasting protection
To keep your rain jacket waterproof for as long as possible, some simple care habits help:
- Wash regularly: Dirt and body oils render the waterproofing ineffective. A clean jacket provides better protection.
- Use special detergent: Regular all-purpose detergent can damage the membrane.
- Store properly: Hang the jacket dry and airy – don't stuff it crumpled into your backpack.
- Combine wisely: If you wear breathable base layers underneath such as men's merino functional underwear, the system of jacket and clothing remains optimally functional.
It's also worth investing in quality for the rest of your gear – such as robust carbon trekking poles that reliably accompany you on every tour.
Frequently asked questions about waterproofing
How often should I waterproof my rain jacket?
It depends on how often you use it. As a rule of thumb: once water no longer beads off but soaks into the fabric, new waterproofing is needed. With intensive outdoor use, this may be necessary once or twice per season.
Can I also waterproof softshell or winter jackets?
Yes. Waterproofing sprays also work on softshell, down or winter jackets. Pay attention to product-specific instructions – down jackets often require a special product that doesn't affect loft.
Is waterproofing harmful to the environment?
Classic waterproofing products contained PFC compounds for a long time. Today there are many PFC-free alternatives that are much more compatible with humans and the environment. When purchasing, look for corresponding information – this way you combine functionality with sustainability.