A heavy duty 6x18 tarp is perfect for a D-I-Y project, protecting outdoor belongings, and more. These versatile, rot-proof, and waterproof tarps come in many colors as well. A 6 x 18 tarp is the best way to shield your lawn equipment and other yard items from the elements, so find the right one for you today. You'll find a 6x18 tarp is rip resistant and serves as UV protection during the heat of the summer day, and assists in melting snow during winter storms.