Wooden swings are a beautiful and classic option, but they do require extra care vs other sewing materials, such as Polywood (recycled plastic). Hardwood swings should be treated with oil occasionally to ensure that it doesn’t crack or warp. A wise step to take is to seal a wooden swing (or buy one with a protective coating). To seal a wooden swing, make sure you coat it thoroughly. You don’t have to apply it exactly evenly. Clean your swing with gentle soap and water, and cover it up during inclement weather. Spray your swing with specialty bug repellent during the Summer if your wood is susceptible.