Ever try to touch up white paint? If it's been there for years, matching it is not easy. Even if you saved some of the original paint, it probably won't match, due to aging. What to do? It's your choice whether to have bright spots, repaint or just live with the knicks, scrapes and gouges? Paint changes color as it ages due to exposure to light and surface contamination. This is especially true with white paint, making touchups years later next to impossible, unless you start adding droplets of comparable black paint to either a can of new white paint or the original can of paint you saved. Add and test until the shade matches. Should this still not work, remove an air vent cover and take it to your local hardware store where they can brew up a computer-generated color match. And that's how to get whites to match with each and every touchup batch. And that's the On The House tip for today.