Every outdoor tent has some degree of water resistance, but there’s more of a range than you might think. Some are waterproof right out of the box, while others are less effective even with a rain fly attached. If you’re unhappy with your tent’s waterproofing or simply looking to improve it, follow these two steps:Seal the seams. Tent seams, particularly those that aren’t well made or have been damaged, are where water can sneak through. First, clean the seams with rubbing alcohol on a rag, then apply a seam sealer. Note that not every seam sealer works with every material. Silicone-treated fabric requires a different sealer than polyurethane-coated fabric, so double-check before buying.Treat the rain fly with a durable water repellent (DWR). These waterproofing sprays are very simple to apply and will stop moisture from penetrating the fabric. First, make sure the rain fly is clean. Liberally spray the rain fly’s exterior and wait a few minutes. Wipe off the excess with a cloth. Make sure the fabric is dry before storing the tent.