The Seattle company’s website says, if you can’t bring them an actual sample of the color that they can match, you can get a paint sample from a local paint store that matches your color, and they’ll match it. That might not be a close enough match to re-gel coat a large area, but it will probably be close enough to touch up small chips, such as around the edge of the door. You might also be able to just take a close-up, daylight photo of your car’s color, and have them match it. It should at least be close. I plan to give it a try.