What did you do to your RV today?

Repaired a crack on the engine coolant overflow tank today on our a class. This Permatex fiberglass/plastic repair kit seemed to work great. Im curious has anyone ever used this for a gray or black tank repair? I have a tank that leaks when nearly full. I haven't really given it much thought to repair because I dump every 4 days. It hasn't caused much concern.. yet!