Can You Treat a Sauna Tent With Waterproofing Spray?

By Zach Francis · Tue Aug 26 2025

If you own a sauna tent or are considering getting one, you’re probably wondering how to keep it in top shape for as long as possible—especially when it comes to weather protection. One common question is whether applying waterproofing spray to a sauna tent is safe, effective, or even necessary.

The short answer is: Yes, you can treat a sauna tent with waterproofing spray—but whether you should depends on the tent's material, existing waterproofing, and how it’s used. Let's break it down.

Understanding Sauna Tent Materials

Before you reach for the nearest can of spray, it's important to understand what your sauna tent is made of. Most high-quality sauna tents, like those from Overland Sauna, use quilted Oxford 210D fabric or similarly rugged materials. These are often:

• Triple-layered for insulation
  
  

• Already coated with a waterproof or water-resistant layer
  
  

• Designed to withstand high heat and humidity
  
  

Cheaper tents may be made from thinner polyester blends or single-layer fabrics that could benefit more from an aftermarket waterproofing treatment.

When Waterproofing Spray Makes Sense

There are a few situations where applying waterproofing spray could be helpful:

1. You Own an Older Tent

Over time, the factory-applied waterproof coating may start to break down—especially if the tent has seen a lot of use, washing, or UV exposure. Reapplying a waterproofing spray can help restore its weather resistance.

2. You’ve Washed the Tent Frequently

Some cleaning solutions or abrasive scrubbing methods can strip away the tent’s original waterproof layer. In this case, spraying a new layer can help maintain its performance in the rain or snow.

3. You Store It Outdoors

If your tent spends time pitched outdoors between uses (e.g., at a cabin), it may be exposed to rain, dew, or snow. Even if it’s insulated, an extra layer of protection can add peace of mind and help extend the tent’s life.

Choosing the Right Spray

Not all waterproofing sprays are created equal—especially for sauna tents, which deal with extreme heat and moisture. Look for these qualities in a spray:

• Silicone-based or fluoropolymer-based: These are effective for synthetic fabrics.
  
  

• Heat-resistant: Avoid sprays that degrade at high temperatures.
  
  

• Non-toxic when heated: This is especially important inside a sauna tent where you’ll be breathing in hot air.
  
  

Some trusted brands for outdoor gear offer sprays specifically made for tents and outdoor fabrics.

Avoid sprays meant for leather, canvas, or clothing unless they are explicitly labeled safe for synthetic tent materials.

How to Apply It Properly

Applying waterproofing spray to your sauna tent isn’t difficult, but it does require some care.

Step-by-Step Instructions:

1. Clean the Surface: Dirt and residue can prevent the spray from bonding properly. Wipe down the tent with water and mild soap if needed. Allow it to dry completely.
   
   

2. Test a Small Area First: Especially if you’re using the product for the first time on that material. Wait 24 hours to check for discoloration or material reaction.
   
   

3. Apply Evenly: Hold the spray can 6–12 inches from the fabric and apply in a sweeping motion. Don’t oversaturate.
   
   

4. Pay Attention to Seams: These are often the first areas to leak. Give them a little extra coverage.
   
   

5. Dry Completely: Let the tent air dry for at least 24 hours before packing or using. Do not apply heat (like a hairdryer) unless the spray specifically allows it.
   
   

Important Considerations

Heat Compatibility

Sauna tents get hot—very hot. Make sure the spray you use won’t off-gas toxic fumes or break down at sauna temperatures (typically 160°F to 200°F). This is especially crucial if the inside of the tent will be treated.

Breathability vs. Waterproofing

Keep in mind that some waterproofing sprays reduce fabric breathability. In a sauna tent, where moisture and humidity levels are high, this could lead to excess condensation if not balanced properly.

If your tent already has an insulated, heat-retaining shell with waterproof features, applying an additional coating may not make a noticeable difference—and in some cases, could affect the fabric’s performance.

When Waterproofing Isn’t Necessary

If you’ve recently purchased a high-end sauna tent like Overland Sauna’s insulated models, there’s likely no immediate need to treat it. These tents come ready for the elements and are already designed to handle moisture, temperature swings, and outdoor conditions.

Instead of spraying, a more beneficial routine might be:

• Drying the tent fully after each use
  
  

• Storing it in a cool, dry place
  
  

• Avoiding prolonged sun exposure
  
  

• Spot-cleaning as needed with water or mild soap
  
  

Use With Caution, Not Necessity

So, can you treat a sauna tent with waterproofing spray? Yes—but you don’t always need to, especially if your tent is already weather-resistant and made with high-quality fabric.

If your sauna tent is older, has been heavily used, or will be stored in damp or harsh environments, applying a trusted waterproofing spray can help prolong its life and keep moisture out.

Just be sure to choose a product that is safe for high-heat conditions and designed for the type of material your tent is made from. When used correctly, waterproofing spray can be a smart maintenance step—but it’s not a must for everyone.

Let your tent’s age, material, and use case guide your decision.