Grangers' Tent + Gear Repel UV is a spray-on waterproofer designed to protect all outdoor gear and equipment from rain and stains. Nothing takes the fun out of being outdoors like getting wet. Over time, and with use, even the best outdoor gear will begin to lose its ability to repel water. This is because dirt, dust, and other impurities, as well as general wear, will remove any water-repellent finish your gear may have been treated with. Cleaning your gear can help but, eventually, it will need reproofing with a water-repellent product.