Can you use exterior paint on an interior? Well… you can, but that doesn’t mean you should. The problem here is that the latest technology in exterior paints is to include pesticides designed to be released a year after painting. This helps to extend the fresh look of the paint and improve on the warranty. If one would use this exterior paint on an interior, a year later the room may start to get smelly from the pesticides. To put it simply, exterior paints are not designed for interiors. This was the tip of the day from your RC Painters, Colorado Springs.