You can check whether a tent is properly waterproofed using the water beading test: sprinkle a little water onto the fabric and see if it beads up into small droplets. If it does, the waterproofing is still effective. If the water soaks into the fabric or forms wet patches, it’s time to re-waterproof it. In this article, we answer the most frequently asked questions about recognising, testing and restoring your tent’s water-repellent coating.
How do you know when your tent’s waterproofing has worn off?
The waterproofing on your tent has worn off when the fabric absorbs water instead of repelling it. You can tell this is the case if the tent fabric turns dark when it rains, feels like wet cardboard, or even starts to leak on the inside. Visible discolouration, a fabric that feels stiff, or a greenish film are also signs that the protective coating has broken down.
The waterproofing does not wear off overnight. It is a gradual process that is accelerated by:
- Frequent exposure to the sun and UV radiation
- Rain, wind and abrasion from contact with branches or the ground
- Cleaning with harsh cleaning products
- Long-term storage in a damp environment
It’s a good idea to check the condition of your tent fabric, especially after winter. Tents that have been stored whilst still damp are at greater risk of damage to the waterproofing and the growth of mould. A quick check in the spring can save you from a wet surprise during your first camping weekend.
What is the water pearl test and how do you carry it out?
The water bead test is the simplest and most reliable way to check whether a fabric has been waterproofed. You spray or drip a small amount of water onto the tent fabric and observe how the water behaves. Does the water bead up into round droplets that roll easily off the fabric? If so, the waterproofing is fine. Does the water soak into the fabric or form flat, spreading patches? If so, it’s time to take action.
Here’s how to carry out the test step by step:
- Make sure the cloth is dry and clean before you start
- Use a plant sprayer or simply let some water from a bottle drip onto the cloth
- Check how the water behaves immediately after application
- Repeat the test in several places, as the waterproofing may wear unevenly
Please note: it is best to carry out the test on a dry day when it is not too cold. Water may react more slowly on a cold cloth, which could skew the result. Also test the seams and corners separately, as these often wear out more quickly than the centre of the cloth.
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What is the difference between a wet tent and a non-waterproof tent?
A wet tent and a non-waterproof tent are two different problems. A wet tent is still waterproof but has a worn-out waterproofing treatment: the fabric absorbs water and feels heavy and damp to the touch, but no water seeps through into the interior. A non-waterproof tent has a damaged coating or seams, allowing water to actually penetrate and making the inside wet.
This distinction is important because the solution differs:
- A wet tent due to poor waterproofing: Impregnating the fabric is enough to solve the problem. The water-repellent layer on the outside restores the water-beading effect.
- A leaking tent due to a damaged coating: Further work is required here, such as repairing or replacing the inner lining, sealing seams with seam sealer, or, in severe cases, replacing the fabric.
A rule of thumb: if the inside of your tent stays dry when it rains but the fabric itself feels heavy and becomes soaked, you have an impregnation problem. If water drips through the fabric or down the seams into the tent, this indicates a waterproofing problem that requires more attention.
How often should you re-waterproof a tent?
As a rule of thumb, you should re-waterproof your tent once every one to two years, but the water beading test provides a more reliable indication than a fixed schedule. The more frequently you go camping and the more your tent is exposed to sun, rain and wind, the faster the waterproofing wears off.
Factors that determine how often you need to waterproof the fabric:
- Frequency of use: A tent that is used every weekend needs more frequent maintenance than one that is only used for two weeks a year
- Type of material: Canvas has different properties to polyester or nylon and may require different care routines
- Climate: Heavy rain, strong sunshine or strong winds accelerate wear and tear
- Storage: Properly stored material (dry, clean, loosely rolled up) ensures that the waterproofing remains effective for longer
It’s a good idea to carry out the water bead test at the start of every camping season. That way, you’ll know in good time whether you need to take action, well before your first trip of the year.
What should you do if the waterproofing no longer works?
If the waterproofing is no longer effective, the solution is to clean the fabric thoroughly and then reapply the waterproofing. Cleaning is an essential first step: dirt, grease and green deposits block the waterproofing agent and prevent it from penetrating the fibres properly. If you skip the cleaning stage, the new waterproofing layer will adhere unevenly or peel off again quickly.
Follow these steps for the best results:
- Clean the cloth: Remove all dirt, green deposits and stains using a suitable cleaning product for tent fabric
- Leave the cloth to dry completely: Never apply the impregnating agent to a damp cloth, as this significantly reduces adhesion
- Apply the waterproofing agent: Work systematically and ensure even coverage, including along seams and in corners
- Leave to soak in and dry: Allow the product sufficient time to penetrate the fibres before you pack away or use the tent
Impregnating canvas requires a little more patience than polyester or nylon, as the material is thicker and takes longer to absorb the impregnating agent. But the principle remains the same: a clean piece of fabric, thoroughly dried, followed by a high-quality impregnating agent that penetrates right into the fibres.
How Rokimi helps with waterproofing your tent
At Rokimi, we offer a complete range of products to help you look after your tent from start to finish, from cleaning to protection. Our products have been specially developed for outdoor fabrics such as canvas, polyester and nylon, and are ready to use straight away without the need for dilution.
- Hood & Tent Shampoo: effectively and safely removes green deposits, dust and light soiling
- Heavy Duty Cleaner: for stubborn stains, mud and ingrained dirt that won’t come out with ordinary shampoo
- Hood & Tent Protection: the most effective waterproofing treatment of its kind, which makes your fabric completely water-repellent after cleaning and keeps it protected against rain and dirt
Whether you’re looking to make your tent water-repellent for the first time or want to restore the waterproofing after the winter, our products are suitable for both beginners and experienced campers. Take a look at our full range product range, discover the applications by material type, or go straight to the Rokimi website for more information.
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VIEW ALL PRODUCTS →Frequently Asked Questions
Can I waterproof my tent without washing it first?
It is strongly advised against waterproofing a tent without first cleaning it thoroughly. Dirt, grease and grime block the pores of the fabric, preventing the waterproofing agent from adhering properly and causing it to be absorbed unevenly. Always clean the tent first with a suitable tent shampoo or a heavy-duty cleaner for stubborn dirt, allow it to dry completely, and only then apply the waterproofing agent to ensure the best possible result.
What is the difference between a spray-on wood preservative and a liquid wood preservative?
Spray-on waterproofing products are handy for small areas, quick touch-ups or hard-to-reach places such as seams and corners. Liquid waterproofing products, which you apply with a sponge or brush, are more suitable for large tent fabrics as they provide a more even and deeper coating. For a full re-treatment after the winter, it is best to choose a liquid product; for occasional maintenance, a spray is sufficient.
My tent is leaking along the seams — will waterproofing still help?
Leaks along the seams indicate a damaged seam seal, and impregnation alone will not solve this problem. Seams are made watertight using a seam sealer, a specialised product that seals the stitches and keeps the water out. First apply a seam sealer to the problem areas, allow it to cure completely, and then waterproof the entire fabric for complete protection.
How do I store my tent properly so that the waterproofing lasts as long as possible?
The biggest enemy of effective waterproofing is moisture during storage. Always ensure your tent is completely dry before putting it away, and store it loosely rolled up or folded in a dry, well-ventilated place away from direct sunlight. Avoid storing it in an airtight bag or a damp cellar, as this encourages mould growth and damages the protective coating.
Can I use any waterproofing product on all types of tent fabric?
Not every waterproofing agent is suitable for every material. Canvas, polyester and nylon each have a different fibre structure and absorb waterproofing agents differently. Always check the product description to ensure that the agent is compatible with your tent material. If you use the wrong product, the waterproofing may not adhere properly or could even damage the fabric.
How long should I wait after impregnation before I can use the tent again?
The drying time varies depending on the product and the ambient temperature, but you should generally allow at least 24 hours before the tent is fully ready for use. In cold or damp weather, the drying time can be as long as 48 hours. Always check the instructions on the packaging of the waterproofing treatment, and make sure the fabric feels completely dry before you store the tent or rely on it in the rain.
What if the water beading test is still negative after waterproofing?
If water still soaks through the fabric after re-waterproofing, there are a few possible causes: the fabric was not completely dry or clean at the time of treatment, the waterproofing agent was not applied evenly, or the coating on the inside of the fabric is damaged. Clean the tent thoroughly again, leave it to dry completely, and apply a second coat of waterproofing agent. If the problem persists, the inner coating may be damaged and you will need a more thorough repair.