Many homes include a mix of siding materials, some of it ready for paint and some that’s probably better left as-is, such as steel, shingles, stone, roofing, etc. This may seem like a no-brainer, but it’s so often missed: Take into account the tone and hue of any finish you’ll leave unpainted and make sure it works with the colors you choose. For example, if your main level is covered in gray and ivory stone, and you’re choosing a color to paint the siding on the second level, choose paints that coordinate and balance proportionally with gray and ivory.