Treated canvas tarps are generally highly water-resistant rather than completely waterproof. Their performance depends on fabric weight, weave density, and the quality of the treatment. Most canvas tarp products rely on Paraffin wax treatment to create a Hydrophobic surface that repels rain, but prolonged exposure to standing water eventually exceeds the fabric's Water saturation point, allowing moisture penetration. Their major advantage over fully waterproof materials is Breathability, which m