How can you repair a crack in the black tank on your RV?

If you have a leaking tank, look for the cause. If it is an inherent weaknesses in the tank causing cracking, there is not much that can be done to prevent it. But if the problem is due to external damage or stresses, look for a way to prevent re-occurrence of the problem. If the tank is being damaged by dragging, simply adding drag wheels on the rear of your rig may eliminate the problem. You can repair your black water tank using adhesives or performing chemical or thermal welding.