How to Waterproof a Tent

 water beading off of a waterproof tent in the rain

When you’re out in the wilderness, one of the sounds of nature you don’t want to hear is water dripping inside your tent. If you’ve been there, it’s time to shore up the waterproofness of your shelter.

There are three ways to waterproof your tent:

  • Seal the seams: Applying seam sealer can help keep moisture from seeping through.
  • Refresh the urethane coating: The urethane coatings on the inside of your rainfly and the floor of your tent are the primary barriers against moisture.
  • Refresh the DWR: A durable water repellent (DWR) coating helps your rainfly shed water.

 

Video: How to Waterproof a Tent

 

Sealing Tent Seams

tent sealant supplies

Many tents come with seams that are sealed, but the sealant can wear out over time, letting water leak through.  

If you find a leaky seam, here’s what you’ll need:
  • A rag
  • Rubbing alcohol
  • Seam sealer (be sure to get the right type for your tent. Silicone-treated fabric takes a different sealer than polyurethane-coated fabrics. Most tents use polyurethane-coated fabrics, but if you’re unsure what type of fabric your tent is made of, check with the tent manufacturer.)
  • Drop cloth to contain spills (optional)

 

Here’s how to seal seams:

  1. Set your tent up in a dry, sunny spot or brightly lit room so you can easily examine all of the seams. You will seal seams on the underside of the fly and the inner side of the tent body. It’s helpful to put the fly on inside out for easier access to the seams.
  2. If you find seam tape that is coming loose on the underside of the fly, gently remove any peeling sections, but leave intact sections in place.
  3. Prep the seams by gently cleaning them with a rag and rubbing alcohol.
  4. Apply the new seam sealer to the seams.
  5. If one seam is beginning to fail, the rest might not be far behind, so you may want to apply seam sealer to all the seams.
  6. Allow the seam sealer to dry completely.

 

Refreshing the Urethane Coating on a Tent

tent urethane coating supplies

If you’ve noticed stuff flaking off of the inside of your rainfly or on the floor of your tent, then it’s time to apply a new urethane coating.

Here’s what you’ll need:

  • A sponge with an abrasive side
  • Rubbing alcohol
  • Tent sealant (again, be sure to get the right type for your tent. Silicone-treated fabric takes a different sealer than polyurethane-coated fabrics. Most tents use polyurethane-coated fabrics, but if you’re unsure what type of fabric your tent is made of, check with the tent manufacturer.)

 

applying urethane sealant to a tent

Here’s how to apply the tent sealant:

  1. Lay your rainfly and/or tent floor flat and gently scrub off the flaking coating with rubbing alcohol and your sponge.
  2. Apply a thin coating of the new tent sealant to the whole fly or tent floor, following the directions on the bottle of sealant.
  3. Let the new coating dry for at least 24 hours before packing your tent away.

 

Refreshing the DWR on a Tent

tent waterproofing supplies

If rain isn’t beading up on your fly anymore, you can refresh the durable water repellent (DWR) coating. Here’s what you’ll need:

  • Waterproof spray, such as Nikwax Tent and Gear SolarProof
  • A clean, damp cloth
  • Water

 

spraying waterproof spray onto a tent

Here’s how to apply the waterproof spray:

  1. Set up the tent and spray down the rainfly with clean water (if you just washed your tent, you don’t have to wait for it to dry before applying a new DWR coating.)
  2. Apply the waterproof spray evenly over the exterior of the rainfly.
  3. After a couple minutes, take your damp cloth and wipe off any excess coating.
  4. Let the tent dry completely before packing it away.

 

 Related Articles

Tent Care Basics

How to Repair a Tent

How to Set Up a Tent