How to Weatherproof Your Outdoor Patio Set: 6 Essential Steps

Not all outdoor furniture requires the same weatherproofing approach. The material your patio set is made from determines exactly which sealant to buy — and how much ongoing maintenance you should expect.

Before you purchase a sealant, consider the level of upkeep you're comfortable with. Wood furniture tends to be more maintenance-intensive than metal; wicker often requires the least effort. Also weigh the aesthetic you want against the lifestyle that supports it. Here's a breakdown of the three most popular patio furniture materials:

Upholstered patio cushions add comfort and personality to any outdoor seating area — but fabric is the most vulnerable part of your patio set when it comes to moisture. Without protection, water can cause the fabric to fade, develop mildew, and structurally break down over time.

Once your cushions arrive, pick up a can of ScotchGuard Heavy Duty Water Shield. Generously spray it across the entire upholstered surface in a well-ventilated area, following the instructions on the can. ScotchGuard causes water to bead and roll off the fabric's surface rather than soaking in, significantly extending the life of the upholstery.

If you live somewhere with long, harsh winters, store cushions in a dry, covered space — like a garage or shed — during the off-season. This prevents color fading and preserves the fabric's structural integrity until spring.

Before applying any sealant or varnish, your furniture needs to be spotlessly clean. Dirt, bacteria, and existing mildew will interfere with how well the sealant bonds to the surface — and trap grime underneath a protective layer.

Mix water with a few drops of dish soap or white vinegar, then wipe down every surface — including all hidden crevices and joints. After any significant weather event like a rainstorm, wipe down exposed furniture promptly to reduce the risk of mildew and rust forming.

If you spot mildew already forming, mix one tablespoon of bleach with a full pint of water and use it to treat affected areas. Be aware, though: once mildew takes hold, it's genuinely difficult to fully eliminate. Prevention — through regular wiping and keeping surfaces dry — is always the better approach.

Sanding is a critical step, especially for wood furniture. It creates a slightly rougher surface texture that allows varnish and sealant to bond more effectively — resulting in a more durable, longer-lasting protective finish.

Start with a rougher-grit sandpaper to remove larger imperfections, splinters, or old peeling sealant. Then switch to extra-fine sandpaper or "0000" steel wool (for metal surfaces) to create a smooth, uniform finish. Once you've finished sanding, wipe down every surface with a damp cloth to remove all dust residue. Allow the furniture to dry completely before moving on to the next step.

You can use an electric orbital sander to speed things up, but hand-sanding works just as effectively on most patio furniture pieces. Either way, this step will noticeably improve the quality and longevity of your final result.

This is the heart of the weatherproofing process. Varnish and sealant work by filling the microscopic pores in your furniture's surface, creating a protective barrier that repels water, resists UV damage, and prevents mildew from taking root.

Using a quality brush or rag, apply the sealant slowly and carefully — covering every surface, including the underside of tabletops, chair legs, and all joinery. Don't rush. The more thorough your application, the better the protection.

• Follow the manufacturer's instructions on the can precisely
• Work in a cool, dry, well-ventilated area
• Allow 24–48 hours of drying time before using the furniture
• If a second coat is recommended, lightly sand between coats for optimal adhesion

Repeat this process annually. A knowledgeable furniture retailer — like the team at Rocking Furniture — can advise on the best product for your specific furniture material and local climate conditions.

Even after completing all five previous steps, a quality water-resistant cover is one of the smartest investments you can make for your patio furniture's long-term care — especially during extended periods when the set won't be in use, or throughout cold-weather seasons.

Many patio furniture brands offer fitted covers designed specifically for their sets. These typically feature a water-resistant outer layer and a padded interior lining for added protection. If you can't find a perfect fit, a heavy-duty tarp secured tightly with bungee cords is an equally effective DIY alternative.

In regions that experience months of winter weather where outdoor furniture simply can't be used, a water-resistant cover is arguably the single most important protection measure you can take — particularly when indoor garage or shed storage isn't an option.