How long does the waterproofing last for the canvas tents?Updated a year ago

That depends on the intensity of the elements the tent is exposed to in use and the conditions in which it is stored. Factors like UV damage during use and high heat or high humidity in storage can weaken the coating. As with any DWR, it will lose efficiency over time. The DWR should last for years with proper use and care. Whether that's 3 years or 15 years will depend on how you use and store the tent. When it loses its coating, you can treat it with Kiwi Camp Dry waterproofing spray.