Could end up with a nightmare. Paint blistering and clogging up downspouts. Catching fire and homeowners not paying (they won't pay ya know when you do something irregular or not according to instructions and it causes a problem). Paint becoming old quickly and bleading all over the brick and siding you just completed. Paint could blister off with tar or asphalt and with the wind blow and stick all over your house. This stuff may all sound ridiculous until its too late.