Greetings. I have gallons of interior reject paints. I also have a recycled chicken coop business. I want to paint some of the coops. As they are chicken coops, they don't have to be perfect, however I don't want the paint chipping off if I can help it. Can I just get some exterior paints and mix the interior paints with the exterior ones? I want to put my interior rejects to use. What do you think would happen... and what ration do you think I could get away with?