- 1). Set up small tents in a level area where tree branches do not touch the canvas. Choose a time when no rain is expected for at least three to four days. Brush the tent with a medium-stiffness brush to remove any dirt and dust. Use a stepladder and an extension handle to reach all parts of the canvas.
- 2). Apply the tent-treating agent to the outside of your tent. Follow the manufacturer's directions for applying the waterproofing agent. Many products are best applied in two light coats. Allow the first coat to dry thoroughly before applying the second coat. Use a stepladder and an extension handle to coat hard-to-reach spots. Do not soak your tent with the waterproofing.
- 3). Treat the inside and outside of your tent with the waterproofing agent. Follow all the manufacturer's instructions, applying two light coats if directed. Allow the waterproofing treatment to dry completely before taking the tent down and storing it.
- 4). Tie a rope between two stout trees at approximately eye level. Tie the rope tightly so that it doesn't sag.
- 5). Drape large tents over the rope tied between the trees. Spread the tent along the rope so there are as few wrinkles in the canvas as possible. Brush off any dirt with a medium-stiffness brush. Use your paintbrush to cover the canvas with the waterproofing agent, following all manufacturer's directions. Apply two light coats if directed, allowing the first coat to dry thoroughly before applying the second.
- 6). Rearrange the tent; expose any canvas that has not yet been treated. Finish treating the outside of the tent, and allow the waterproofing agent to dry completely.
- 7). Turn the tent inside out; drape it over the rope once again. Paint the interior of the tent with the waterproofing agent. Allow the coating to dry completely before turning the tent right-side-out and putting it away. Do not put the tent away if the coating is tacky.
- 8). Spray the tent's zippers with a silicone spray to keep them working smoothly.
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