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Most manufactures of quality waxes say their products last for an average of 6 months. But why would you wait for your wax to be completely GONE before applying more? We recommend to wax your RV every 3 months, unless you feel it requires more.
Furthermore, Black, Red and other dark colored cars may require extra attention and need to be waxed every 2 months or more - depending on the circumstances.
You can be the best judge of that just by paying attention to your rig.