If you want to waterproof your tent, first you need to ensure whether your tent is leaking or not? If leakage is found then, you can use waterproofing spray on leakages. Silicon spray is considered as the best waterproof spray due to its water-resistant characteristics. It also has a moisturizing property. Silicone spray waterproofing provides the ideal way of coating fabrics. It helps the rainwater to roll off the material without soaking. Starbrite Silicone Water-Guard is a good spray for silicone waterproofing. And it can be used for tents, outerwear, sleeping bags and more items. It is easy to apply. Or, you can use tent seam sealant to fix leaking seams. Reseal seams using a tape.