Regularly waterproofing your tent fabric ensures that your tent remains water-repellent, lasts longer and is better able to withstand the elements, such as rain, damp and dirt. A well-waterproofed fabric repels water before it can soak into the fibres, which prevents mould growth and damage to the material. In this article, we answer the most frequently asked questions about waterproofing tent fabric, from how long the protection lasts to when it’s best to start.
How long does a waterproofed tent fabric remain water-repellent?
An impregnated tent fabric remains water-repellent for one to two seasons on average, depending on how often you go camping, how you clean the fabric and the weather conditions to which it is exposed. The more often your tent is used, washed or exposed to sun and rain, the faster the waterproof coating will wear off.
The quality of the waterproofing agent used also plays a major role. Professional waterproofing agents penetrate deep into the fibres of the fabric and therefore offer more durable protection than surface sprays. However, no waterproofing treatment is permanent. Friction, UV radiation and repeated washing gradually reduce the water-repellent effect.
A practical way to check whether your tent fabric is still sufficiently waterproofed is the water droplet test. Splash a little water onto the tent fabric. If the water beads up into small droplets, the waterproofing is still effective. If the water soaks into the fabric and leaves dark patches, it’s time to re-waterproof it.
What happens if you don’t waterproof a tent?
If you do not waterproof a tent, the fabric loses its water-repellent properties and rainwater begins to seep through the fibres. This not only leads to a wet interior, but also to damp fabric that attracts mould, green deposits and unpleasant odours. In the long term, it damages the structure of the material.
Tent fabric that is constantly damp and does not dry properly provides an ideal breeding ground for mould spores. Mould literally eats its way into the fibres, causing the fabric to discolour and weaken. Once mould has penetrated deep into the fabric, it is extremely difficult to remove and can cause permanent damage to the tent fabric.
Furthermore, an unimpregnated fabric gets dirty more quickly. Dirt, dust and algae adhere more easily to a fabric that lacks a protective layer. This means you’ll have to clean it more often and more thoroughly, which further shortens the lifespan of your tent. Regularly waterproofing the fabric is therefore not just a matter of comfort, but also of protecting your investment.
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How often should you waterproof your tent fabric?
As a rule of thumb, you should re-waterproof your tent fabric at least once a year, preferably at the start of the camping season. If you camp frequently or pack your tent away several times a year in damp conditions, it’s a good idea to do this twice a year.
The frequency depends largely on use and maintenance. A tent that is cleaned regularly will need re-waterproofing more often, as washing partially removes the water-repellent coating. Always carry out a water droplet test after every thorough clean to determine whether re-waterproofing is required.
If you’re putting your tent away for the winter, it’s a good idea to clean it at the end of the season and then waterproof it. That way, your tent will be stored with a protective layer and you’ll be ready to use it straight away in the spring. This also prevents mould or damp from taking hold whilst it’s in storage.
Does impregnation also protect against mould and green deposits?
Impregnation provides indirect protection against mould and green deposits. By making the fabric water-repellent, you prevent moisture from lingering in the fibres for long periods. Dry fibres are a much less favourable environment for mould spores and algae, which significantly slows down the build-up of green deposits and the growth of mould.
However, it is important to understand that waterproofing does not have an immediate fungicidal or algicidal effect. It does not remove existing mould or green deposits. If your tent already has stains or deposits, you must clean it thoroughly before applying the waterproofing. Applying a waterproofing treatment to a dirty or mouldy fabric traps the dirt within the fibres and makes subsequent cleaning more difficult.
Combining cleaning with subsequent waterproofing is therefore the most effective approach. First clean the fabric, then leave it to dry, and only then carry out the waterproofing step. This way, you benefit from the protective effect on a clean fabric and effectively slow down future growth of mould and algae.
Does waterproofing work on all types of tent fabric?
Most professional waterproofing products work on common types of tent fabric, such as canvas, polyester and nylon. These materials respond well to water-repellent treatments and absorb the product into their fibres. However, it is always a good idea to check the label on the waterproofing product before you start.
Canvas is a thicker, more natural material that can be easily waterproofed but absorbs more of the waterproofing agent than synthetic fabrics. Polyester and nylon have a smoother texture and absorb the waterproofing treatment more quickly. For all these materials, the fabric must be clean and dry before you apply the waterproofing treatment to ensure the best possible result.
Some tent fabrics come with a factory-applied waterproofing treatment. This factory-applied coating wears off with use and needs to be reapplied over time using a suitable waterproofing agent. If in doubt, always check the tent manufacturer’s recommendations for the most suitable product for your specific type of fabric.
When is the best time to waterproof a tent?
The best time to waterproof a tent is at the start of the camping season, after you have thoroughly cleaned the fabric and allowed it to dry completely. This way, you’ll start the season with maximum protection. The end of the season, just before putting it into storage, is another excellent time to do this.
Choose a day with dry, mild weather when treating the fabric outdoors. Heat and direct sunlight can cause the waterproofing agent to dry too quickly before it has been properly absorbed into the fibres. A cloudy day with temperatures between 10 and 25 degrees is ideal.
Always make sure the fabric is completely dry before you start. Applying the waterproofing treatment to damp or wet fabric does not work well: the product does not adhere properly and the water-repellent effect is significantly less effective. After cleaning, leave your tent to dry for at least 24 hours before applying the waterproofing treatment. This will ensure you get the most out of the waterproofing agent and enjoy a well-protected tent throughout the season.
How Rokimi helps with tent canvas impregnation
At Rokimi, we offer a complete range of professional products to help you look after your tent fabric from start to finish. Whether you’re dealing with light soiling, stubborn stains or fabric that has lost its water-repellent properties, we have the right solution.
- Hood & Tent Shampoo: Ideal for routine maintenance and for removing green deposits and surface dirt from canvas, polyester and nylon fabrics.
- Heavy Duty Cleaner: Specially developed for stubborn and ingrained dirt such as mud, grass stains and black streaks that have penetrated deep into the fibres.
- Hood & Tent Protection: the most effective waterproofing treatment of its kind, which makes your cleaned cloth water-repellent and protects it against rain, damp and dirt.
All products are ready to use and do not need to be diluted, so you can get started straight away. They are suitable for the most common types of fabric and are easy to use for both experienced campers and beginners. View our full product range or find out which applications our products are suitable for. Ready to give your tent the best possible protection? Visit rokimi.com and place your order today.
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VIEW ALL PRODUCTS →Frequently Asked Questions
Can I waterproof my tent without cleaning it first?
No, it is strongly advised against waterproofing a tent without first cleaning it thoroughly. Otherwise, dirt, dust and mould residues will be sealed in during the waterproofing process, making them harder to remove and significantly reducing the product’s adhesion. Always clean the fabric first with a suitable tent shampoo or cleaner, allow it to dry completely, and only then apply the waterproofing agent to ensure the best possible result.
What is the difference between a waterproofing spray and a liquid waterproofing agent?
An impregnating spray is handy for small surfaces, seams and hard-to-reach areas, but generally does not penetrate the fibres as deeply as a liquid product. Liquid waterproofing agents, which you apply with a sponge or brush or by fully immersing the fabric, offer more thorough and long-lasting protection for larger tent fabrics. For a complete treatment of an entire tent, a professional-grade liquid waterproofing agent is preferable.
How can I be sure that the wood preservative has been properly absorbed?
After applying the waterproofing agent, leave the fabric to dry completely, preferably in the open air on a dry, overcast day. Next, carry out the water droplet test: splash a little water onto the treated fabric and check whether the water beads up into tight droplets. If this is the case, the treatment has been properly absorbed and is active. If the water is still being absorbed into the fabric, a second treatment may be necessary.
Can I waterproof a tent that is already showing signs of mould?
No, impregnation does not solve an existing mould problem and may even make it worse by trapping the mould spores within the fibres. First, treat the mould thoroughly with a suitable cleaner that penetrates deep into the fibres, such as a heavy-duty cleaner. Then allow the fabric to dry completely and check that all the mould has been removed before proceeding with waterproofing.
Is waterproofing still necessary even if my tent is still relatively new?
Yes, even new tents benefit from being waterproofed. The factory waterproofing applied at the time of purchase wears off after just a few seasons of use, washing and exposure to UV rays. By starting regular maintenance early on, you’ll significantly extend the life of your tent and prevent moisture, mould and dirt from causing premature damage. Carry out a water droplet test after each season to determine when a top-up treatment is needed.
Can I roll up and put my tent away straight away after waterproofing it?
No, make sure the fabric is completely dry before you roll it up and put it away. A tent that is stored whilst damp or before it has fully dried out can encourage mould growth, which is exactly what you want to avoid. After the waterproofing treatment, leave the tent to dry for at least 24 hours in the open air or in a well-ventilated area, and only then store it in a dry, well-ventilated place.
Can I use the same waterproofing treatment on other outdoor gear, such as awnings or rucksacks?
Many professional tent waterproofing products are also suitable for other outdoor textiles such as awnings, parasols, rucksacks and garden cushions, provided the material is similar (canvas, polyester or nylon). Always check the label of the waterproofing treatment for the recommended uses and materials. This way, you’ll get the most out of a single product whilst ensuring consistent protection for all your outdoor gear.