Sooner or later, every outdoor enthusiast asks themselves: "How do I make my rain jacket waterproof again?" At the latest when the clothing underneath gets wet, a quick and sustainable solution is needed. In this article, we show you how to waterproof your rain jacket the easy way: incl. instructions – step by step, with all the 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 care for your clothing, it's worth taking a closer look at the basics. In simple terms, waterproofing ensures that water beads off your jacket instead of seeping in. 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 regularly maintain and re-waterproof your clothing. Similar to the proper care of merino wool, the rule is: those who treat their functional clothing well will enjoy it for a long time.
How do I know if the waterproofing still works?
You can tell if the waterproofing is still working by how well it repels moisture. Normally, water droplets bead off your hardshell jacket and simply run down the fabric. This keeps you pleasantly dry.
But it's not just water resistance that matters – breathability also depends directly on the waterproofing. When you start sweating on a hike or climb, water vapor forms. With a good hardshell jacket, this can escape to the outside through the membrane and ensures a pleasant body climate.
If the waterproofing is insufficient, a film of water forms on the outside. The water vapor remains trapped inside, the jacket clings to your body and you feel damp. This is simply because breathability only works when the fabric stays dry on the outside. By this point, you should definitely take action. Those on longer tours – for example with an ultralight 40-liter backpack for winter tours – are particularly dependent on reliably water-repellent clothing.
Waterproof your rain jacket the easy way: step-by-step instructions
As is often the case in life, there's no 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 or winter jackets. Here's how to proceed:
- Preparation: Close all zippers and wash your jacket according to the care label. Only clean clothing can be waterproofed effectively – dirt, dust and grease prevent the treatment from working.
- Check the label: Some sprays should be applied to damp fabric, others to dry fabric. It's worth checking the instructions here.
- 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 like shoulders, seams, pockets, zippers, back and hood.
- Let it work: After a few minutes, wipe off excess spray with a clean cloth to prevent stains from forming.
- 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 used jackets, waterproofing in the washing machine is often more effective because the product penetrates the fabric completely. Important: The washing drum should be completely clean beforehand, as residual detergent can reduce the effectiveness. The liquid waterproofing agent goes in the detergent dispenser, then wash on a gentle cycle.
Option 3: Activation through heat
Many modern waterproofing treatments develop their full effect only through heat. A short cycle in the dryer (if the care label permits) or carefully ironing at low temperature with a pressing cloth significantly reactivates the DWR layer.
Tips for long-lasting protection
To keep your rain jacket waterproof for as long as possible, a few simple care habits help:
- Wash regularly: Dirt and body oils neutralize the waterproofing. 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 jacket and clothing system remains optimally functional.
It's also worth investing in quality for the rest of your equipment – for example, durable carbon trekking poles that will reliably accompany you on every tour.
Frequently asked questions about waterproofing
How often should I waterproof my rain jacket?
This depends on usage. As a rule of thumb: Once water no longer beads off but soaks into the fabric, a new waterproofing treatment is needed. With intensive outdoor use, this may be necessary one to two times 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 compromise loft.
Is waterproofing environmentally harmful?
Traditional waterproofing treatments long contained PFC compounds. Today there are many PFC-free alternatives that are much more tolerable for humans and the environment. When buying, look for corresponding labels – this way you combine functionality with sustainability.