Outdoor cushions are a great way to make your patio, deck, or poolside more comfortable and inviting. However, outdoor cushions are exposed to the elements and can easily get wet from rain, sprinklers, spills, or humidity. Wet cushions can quickly become moldy, smelly, and unusable. The best way to protect your outdoor cushions is to make them waterproof. Waterproofing outdoor cushions is an easy process that will prolong the life of your cushions for many seasons.

Choose the Right Outdoor Cushion Materials

When shopping for outdoor cushions, choose cushions made from water-resistant materials. The outer fabric of the cushion should be made from solution-dyed acrylic, polyester, olefin, or vinyl. These synthetic fabrics are naturally water-repellent. The inner cushion fill should also be water-resistant, such as polyester fiberfill batting or reticulated foam.

Avoid cushions filled with cotton batting or feathers, as these materials will hold moisture and take a long time to dry. It’s best to select outdoor cushions specifically designed and marketed as waterproof or water-resistant. Check product details and descriptions when shopping online or in stores.

Apply a Waterproofing Spray

One of the easiest ways to make outdoor cushions waterproof is by applying a commercially available waterproofing spray. There are many brands that make heavy duty or marine grade waterproofing sprays designed for outdoor fabrics. When choosing a spray, look for the following features:

Specifically designed for outdoor fabrics
Contains UV blockers to resist fading
Allows fabric to breathe
Dries invisibly without leaving a residue
Environmentally friendly ingredients

Before spraying, read all directions carefully and apply in a well-ventilated area. To apply the spray:

Lay the cushion on a tarp or garbage bag outside or in a well-ventilated room.
Hold the can 6 to 8 inches from the cushion surface.
Press the nozzle and spray the entire outer surface of the cushion using long, even strokes.
Let the cushion dry completely before using, usually 1 to 2 hours.
For the best water resistance, apply 2 to 3 coats of spray according to the product directions. Allow each coat to completely dry before the next application.

Reapply the spray every 1 to 2 months or as needed after heavy rainstorms and sprinkler exposure to renew water protection.

Use a Waterproof Cover

Adding a waterproof cushion cover is another excellent way to protect the cushion from moisture. Look for cushion covers made from vinyl, polyester, canvas, acrylic, or olefin. Check that the fabric has a high denier rating of at least 300D for strength. The seams should also be sealed or double stitched for water resistance.

When shopping for a waterproof cushion cover, bring the cushion to the store to ensure a proper fit. The cover should be slightly larger than the cushion to allow room for the cushion insert. Use the drawstring or zipper closure to securely fit the cover over the cushion.

With a waterproof cushion cover, you can leave the cushions outside all season without worrying about rain or morning dew. Simply unzip and remove the cover to wash and air dry as needed.

Treat Fabric with Waterproofing Compounds

For do-it-yourself waterproofing, you can use water repellent compounds like Scotchgard. Be sure to use heavy duty Scotchgard designed for outdoor items instead of standard Scotchgard for indoor fabrics.

To apply:

Wash and thoroughly dry the cushion.
Lay the cushion flat on a tarp or garbage bag.
Shake the can well and hold it 6 to 8 inches from the cushion surface.
Press the nozzle and lightly coat both sides of the entire cushion using a side to side sweeping motion.
Let the cushion completely air dry for at least 1 hour before using.
Apply a second coat for maximum protection.
Reapply every 1 to 2 months as needed for continued water resistance.

Other waterproofing compounds like 303 Aerospace Protectant can also be used following the manufacturer’s application instructions.

Seal Seams with Waterproof Tape

If your outdoor cushion has seams, you can further waterproof it by sealing the seams with a waterproof tape. This prevents moisture from seeping in through the stitching. Look for tape designed for outdoor use such as:

Gore-Seam Sealant Tape
Heat Bond Seam Tape
Therm-O-Seal Seam Tape
EternaBond Seam Seal Tape

Follow these steps to apply waterproof seam tape:

Clean and dry the cushion thoroughly.
Cut pieces of seam tape 1 to 2 inches longer than each cushion seam.
Remove the paper backing from the tape.
Position the adhesive side of the tape directly over the seam, pressing it down firmly.
Use your hands to smooth out any bubbles or wrinkles.
Apply firm pressure along the tape to ensure a tight seal.
Trim any excess tape hanging off the seam edges.

The tape will instantly adhere to the cushion fabric, providing a waterproof barrier along the seams.

Re-treat Fabric Every Season

Any waterproof treatments used on outdoor cushions will need to be reapplied periodically. Plan on re-treating your waterproofed cushions at the beginning of each outdoor season. This will renew the protective water barrier, especially if the current treatment has started to wear off over the winter.

First, clean the cushions thoroughly and allow to fully air dry. Then simply reapply your chosen waterproofing method – spray, covers, Scotchgard, tape, etc. Getting into the habit of seasonal waterproofing will add many extra years of life to your outdoor cushions.

Allow Proper Drying Time

Part of properly caring for waterproofed outdoor cushions is allowing enough drying time after wet weather. If your cushions do happen to get soaked from heavy rain or morning moisture, stand them up on end and allow to completely air dry before putting them back on the furniture. Never put away wet cushions in storage.

In humid climates, consider placing waterproof cushions in an outdoor screened room, patio enclosure, gazebo canopy, or covered porch area to protect from moisture and allow good airflow for faster drying. Remove and dry waterproof covers before placing the cushions back outside.

Clean and Store Properly

Use a mild soap and lukewarm water to clean waterproofed cushions as needed, especially at the end of the season. Rinse well and air dry fully. Check for mold if cushions have stayed wet for long periods.

Before storing cushions away for the winter months, apply fresh waterproofing treatment and check for holes, mildew, or other damage. Place clean, fully dried cushions in a waterproof storage bin or bag.

Proper storage will help waterproofing treatments remain effective so cushions are ready to repel water again next outdoor season.

Why Waterproof Outdoor Cushions?

Waterproofing outdoor cushions is highly recommended for several important reasons:

Extends the Life of Cushions

Outdoor cushions are often expensive investments. Waterproofing helps protect your investment by keeping cushions in useable condition for many years.

Prevents Mold and Mildew

Wet cushions easily grow mold, mildew and bacteria when left damp. Waterproofing prevents moisture absorption to resist unhealthy mold growth.

Keeps Cushions Looking New

Water leads to staining, discoloration and fading of fabric. A good waterproof treatment helps outdoor cushions retain their vibrant color and appearance for longer.

Adds Quick Drying Time

Non-waterproof cushions can take days to fully dry once wet. Waterproofed cushions dry in just 1 to 2 hours so they can be used again quickly.

Allows Regular Outdoor Use

Waterproofed cushions can stay outside through light rain and morning moisture without concern. No need to constantly move cushions indoors and out.

Provides UV Protection

Many waterproofing sprays and compounds contain UV blockers to guard against sun damage and fading.

Affordable and Easy Process

There are many waterproofing products readily available at low cost. Application is a quick and easy do-it-yourself project.

Reduces Need to Repurchase

Waterproofing extends cushion life so you get years of use from one cushion set instead of having to continually buy replacement cushions.

Waterproofing is a smart way to protect your investment in comfortable, stylish outdoor cushions for seasons of lasting enjoyment.

Common Waterproofing Mistakes

Waterproofing outdoor cushions is simple when done properly. Avoid these common mistakes for the best results:

Using indoor Scotchgard instead of heavy duty outdoor formula
Skipping seam sealing with waterproof tape
Not spraying both sides and underside of cushion
Leaving spray residue to dry instead of buffing with a towel
Using oil-based sprays that leave fabric feeling stiff
Assuming cushions are waterproof without treating them
Not reapplying waterproofing at the start of each season
Allowing cushions to air dry upside down instead of standing upright
Putting damp or wet cushions into storage
Not checking for wear and damage before storage
Forgetting to waterproof zippered cushion covers

With attention to detail and proper application, these mistakes can be avoided for optimally waterproof outdoor cushions.

Materials to Make Outdoor Cushions Waterproof

There are several effective waterproofing products and materials to choose from to protect your outdoor cushions:

Waterproofing Sprays

Scotchgard Heavy Duty Water Shield – Repels liquid, resists UV rays
303 Fabric Guard – Contains UV screeners, repels oil and stains
Kiwi Camp Dry Heavy Duty Water Repellent – Silicone-based formula resists water
Star brite Waterproofing with PTEF – Guards against fading, mildew, soil
Liquid Rubber Waterproof Sealant Spray – Flexible coating for fabric, seams, zippers

Specialty Tapes

Therm-O-Seal Weather Resistant Seam Seal Tape – Seals sewn seams
Gear Aid Gore Seam Seal Tape – Adheres instantly for permanent waterproof seal
EternaBond Weather Resistant Sealant Tape – Withstands sun, water and freezing

Fabric Waterproofers

Scotchgard Heavy Duty Outdoor Fabric Water Shield – Repels spills and moisture
303 Fabric Guard – Protects from UV rays, mildew, staining
Kiwi Camp Dry Fabric Protector – Water-based and environmentally-friendly

Cushion Covers

Duck Covers Ultimate Waterproof Patio Cushion Covers – Durable vinyl, zippered
Classic Accessories Ravenna Water-Resistant Outdoor Cushion Covers – Polyester with TPU laminate
Kover-Tite Water Resistant Patio Chair Cushion Slipcovers – Ultrasonically welded seams

Storage Bags

Duck Covers Ultimate Air-Flow Patio Cushion Storage Bag – Vents moisture, shields dust
Amazon Basics Waterproof Patio Cushion Storage Bag – Waterproof PVC with Buckles
Kover-Tite Patio Cushion Storage Bag – Water resistant polyester

Step-By-Step Guide to Waterproofing Outdoor Cushions

Follow these simple step-by-step instructions to properly waterproof your outdoor cushions:

Step 1: Choose Waterproofing Method

Decide which waterproofing option best suits your needs – sprays, compounds, covers, or tapes. Consider cost, availability, reapplication needs, and convenience.

Step 2: Read Product Instructions Carefully

Read all labels, directions, warnings, and application tips before you begin. Follow manufacturer’s instructions for best results.

Step 3: Prep the Cushion Properly

Clean cushion with mild detergent if dirty. Rinse thoroughly and allow to completely air dry before waterproofing. Spot clean any stains first.

Step 4: Work in a Well-Ventilated Area

Work outside or in a room with excellent airflow. Use tarps or bags to protect the floor from drips.

Step 5: Apply the Waterproofer

Use smooth, even strokes to coat the entire outer surface and underside. Allow proper drying time before second coat.

Step 6: Seal Seams (Optional)

For sewn seams, apply special waterproof seam tape for full protection. Smooth and firmly press to seal.

Step 7: Allow Full Drying

Stand cushion upright and allow 1 to 2 hours drying time before use, longer in high humidity.

Step 8: Reapply as Needed

Re-coat cushions every 1-2 months during outdoor season for optimal water protection.

And that’s it! Proper preparation and application are key for long-lasting waterproofing of your outdoor cushions.

Tips for Proper Waterproofing

Follow these helpful tips when waterproofing outdoor cushions for best results:

Shake cans vigorously – This ensures compounds and sprays mix properly and distribute evenly across the fabric surface.
Apply in a warm, dry area – Heat helps waterproofing solutions cure and bond tightly to the fibers. Avoid wind or humidity.
Wear gloves and eye protection – Waterproofing sprays contain harsh chemicals and propellants that can irritate skin and eyes.
Use smooth strokes – Gentle, even motions prevent dripping or spotty application that can lead to missed areas of coverage.
Mist seams – Pay special attention to lightly misting cushion seams and crevices for full saturation.
Blot excess liquid – Gently blot any pools of liquid with a towel to prevent waterproofing buildup and residue.
Dry upright – Standing cushions on end allows airflow all around and prevents pooling of liquid at the underside.
Work in sections – On large cushions, divide the surface into sections to ensure thorough, even coverage.
Refill as needed – Have additional waterproofing product on hand for touch-ups on missed spots after initial application.

Proper preparation, application techniques, and thorough drying are key for getting superior water resistance from your outdoor cushion treatments.

How to Clean Waterproof Outdoor Cushions

Normal use will dirty and stain your outdoor cushions over time. Here is how to properly clean waterproofed cushions:

Check the Care Label

The cushion manufacturer’s care label will specify recommended cleaning methods. Common instructions include:

Machine wash gentle cycle with cold water
Spot clean only with mild detergent
Professional dry cleaning
Air dry only

Follow all label directions to prevent damaging the fabric or ruining the waterproofing.

Vacuum Regularly

Use the soft brush nozzle on your vacuum to remove loose dirt, debris, pollen, and pet hair from the cushion surface. Avoid using the beater bar head.

Spot Clean Spills and Stains

Mix a mild detergent like Woolite with lukewarm water. Use a soft sponge or white cloth to gently blot the stained area. Avoid rubbing or scrubbing aggressively at the fabric. Rinse clean.

Disinfect with Vinegar

Mix equal parts white vinegar and water in a spray bottle. Lightly mist the solution over the entire surface and let sit 5 minutes before wiping off with a towel. This removes bacteria and deodorizes.

Use Oxyclean or Vinegar for Mold

For minor mold spots, mix 1 cup Oxyclean powder with 1 quart hot water. Alternatively, mix equal parts white vinegar and water. Spray or sponge onto the mold and let sit 1 hour before rinsing clean.

Allow Proper Drying

After washing or cleaning, stand cushions upright and allow 1 to 2 days to fully air dry before reuse or storage. Never put damp cushions away.

Proper weekly cleaning keeps outdoor cushions fresh and free of stains while professional cleaning or re-treating annually helps waterproofing treatments remain effective. Avoid overly frequent washing that can degrade fabric and seams over time.

FAQs About Waterproof Outdoor Cushions

Still have questions about waterproofing outdoor cushions? Here are answers to some commonly asked questions:

How long does waterproofing last on outdoor cushions?

Most waterproofing sprays and coatings last 1 to 2 months with regular outdoor use. Reapply every month during peak season for best water resistance.

Can you put waterproof cushions in the washing machine?

Check manufacturer guidelines, but most waterproof cushions should be washed by hand or spot cleaned only to prevent damage to the waterproof coating.

How do you waterproof cushion foam?

Outdoor cushion foam can be waterproofed by spraying or dipping into a water repellent chemical solution. Or simply encase foam in a waterproof fabric cover.

What happens if waterproof cushions get wet?

Water will bead up and roll off instead of soaking in. Simply tip the cushion upright to dry. No need to replace as long as waterproofing was applied properly.

How do I get mold off outdoor cushions?

Use an Oxyclean and water solution or equal vinegar and water solution. Spray it on mold spots, let sit 1 hour, then rinse clean and allow to dry fully standing upright.

How do you keep outdoor seat cushions from sliding?

Use cushion grippers, velcro strips, ties, elastic bands, or double sided slip resistant mesh strips on the cushion bottoms to keep them firmly in place on furniture.

Should outdoor cushions be brought inside at night?

If properly waterproofed, cushions can stay out overnight, but nightly temperature drops can shorten fabric life. Bringing them in helps cushions last

How to Make Outdoor Cushions Waterproof