First, off-canvas tarps are not 100% waterproof, though they are water-resistant. Thus, while a little bit of water for a short period will not affect them, HOWEVER, when there is standing water on canvas tarps, or when water cannot quickly drain away from canvas tarps, the standing water will drip through.
Tarps tend to break down in ultraviolet light. The average lifespan of a plastic tarp exposed to sunlight is not great – generally three to five years. Even when they appear entirely intact, the material deteriorates daily on a micro level, making them more prone to leaks and tears as they age.
Other BLUE TARP fails:
Rainy Day Leaks
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