Good money in smuggling paint across the border.
More seriously, decades ago my mother tried to track down how we were supposed to properly dispose of old house paint, because the city's Household Hazardous Waste site wouldn't accept it. No one could answer the question (and my mother was tenacious). Apparently, it came down to "Throw it in the trash, let it be buried in a landfill, and wait for it to contaminate something."