How to Waterproof a Rain Jacket | Restore the Bead

Waterproofing a rain jacket is normally about restoring the DWR finish on the outer fabric, which stops working when water stops beading up.

For the full breakdown, see our best Camping Rain Jacket guide.

If your rain jacket is soaking through, the first question is whether the waterproof membrane has failed or whether the outer fabric’s durable water repellent (DWR) coating has worn off. For most jackets, it’s the DWR. The fix is a clean, a heat reactivation, and only if that fails, a fresh DWR treatment. Here’s the reliable order of operations.

Clean the Jacket First

Waterproofing only works properly on a clean garment. Dirt, body oils, and detergent residue block the DWR from bonding to the fabric and can make the jacket wet out faster. Never skip this step.

GORE-TEX’s official care guidance, which applies to most technical shells, calls for machine washing at 105°F (40°C) with a small amount of liquid detergent. Before washing, zip the front, pockets, and pit zips completely closed so the fabric doesn’t snag. Use a front-loading machine if you have one — top-loaders with a center agitator can be rough on a technical shell.

Skip fabric softener and chlorine bleach. Both can compromise water repellency and damage the membrane. GORE-TEX’s guidance consistently warns against them, and standard household detergents often leave a residue that attracts water. Use a dedicated technical wash or a mild liquid soap.

Heat to Reactivate the DWR

After the wash, the next step is often all you need. Tumble dry the jacket on a warm, gentle cycle, or line dry it. Once it’s dry, GORE-TEX recommends an extra 20 minutes of tumble drying. That heat cycle is what reactivates the DWR finish, pulling the treatment back to the surface of the fabric where it can do its job.

If you don’t have a dryer, GORE-TEX says you can use a warm iron on a gentle, no-steam setting with a towel or cloth between the iron and the jacket. Keep the iron moving and never put a hot iron directly on the membrane.

Avoid high heat. Intense drying temperatures can damage the membrane and melt the DWR, so stick with a warm, gentle cycle rather than cranking the dryer to its hottest setting.

Reapply DWR Only If Water Stops Beading

Here’s the test. Splash some water on the shoulder or sleeve. If it beads up and rolls off, the DWR is working and you’re done. If the water soaks into the fabric or forms a flat wet patch, the DWR has worn through and needs to be reapplied.

Crucially, reapply DWR only when that beading test fails after a clean and reactivation. Spray-on DWR treatments for outer shells are easy to apply and are the standard choice for most hikers. Follow the product’s instructions, then reactivate it with another 20-minute warm tumble dry or the warm iron method. GORE-TEX’s guidance stresses this two-step loop: clean, reactivate, test, and re-treat only if needed.

One important exception: do not apply DWR to GORE-TEX SHAKEDRY garments. Those products are designed with a persistent beading surface that doesn’t need — and shouldn’t receive — a DWR treatment. Always check the care label on your specific jacket before applying anything.

Also understand the limits of a DWR treatment. It restores surface repellency on the outer fabric, which prevents the shell from wetting out. It will not fix a torn membrane, a failed seam, or a leaky zipper. If your jacket is leaking through those structural points, no amount of DWR will help — it may be time for a repair or a replacement. If you’re in the market for a new shell, our roundup of the best camping rain jackets is a good place to start comparing options.

Follow that sequence and most jackets will shed water again after a single wash-and-dry cycle. For more detail, GORE-TEX’s guide to restoring durable water repellency on raingear walks through the same steps, and their outerwear care page covers the full washing procedure. The short version: a little upkeep goes a long way, and it usually costs a wash cycle, not a new jacket.