Paint may be a very emotional decision for consumers, but in the retail world, it’s a simple business plan: If you want to sell a lot of paint, dedicate enough space to it, assign a full-time, well-trained sales associate to the paint desk, and carry more than two lines of paint. One of those brands should cater to the pros. Find a way to keep the contractors separated from the homeowners, which is not all that difficult; professional painters don’t like to sit on sofas surrounded by tasseled pillows.