Camping is great fun, until it rains and the camper leaks. Newer models of pop-up campers are waterproofed, but waterproofing needs to be reapplied from time to time. Canvas can be waterproofed in an afternoon. The process not only keeps camper occupants dry, it protects the canvas itself against mildew and dirt.
Set up the camper outside -- away from trees -- in an open area close to a water source. Extend the camper to its full size.
Wash the pop-up camper with a mild soap and soft brush. Rinse well and let it dry.
Pour waterproofing into a 1-gallon bucket. Work from the top of the camper down, applying an even coat of waterproofing with the paint brush.
Let the first coat dry, and then reapply.
Apply seam sealer to all seams inside and out. Let the sealer dry.
Spray the camper with water. Check inside for leaks.
Do not use a silicone waterproofing product on an acrylic canvas. Silicone causes patchy areas on acrylic canvas, and allows water to leak through.