Yes! We've heard from many customers who have done this and been delighted with the results. If your repairs are very small and not at eye level, a "close enough" match may be all you need. If it needs to be more precise, mixing two colors is certainly an option, however, it will require some trial and error. For the best chance of success, here are some tips:
1. ALWAYS mix outside the bottle rather than tinting the entire bottle. (Once you change it, you can't undo it, so it's best to work with only a small amount, so you can start over or add more of the original color if you got the altered paint too light or too dark.)
2. Rinse one of the brush heads with water and mild soap to use with the "new" color
3. Pour a small amount of the first color onto a tray, then incrementally add the second color to it. "Incrementally" is key! Go slowly, and test to see if it's the right color. If not, add a bit more, then test. Repeat until you find your match. Then use your clean brush to apply the "new" paint to the defect. (We have even had customers have good results with using food dye or ink, to get closer to the exact match. Be aware, however, that with these dyes, a little goes a very long way. We would recommend dipping the end of a toothpick into the dye, rather than using whole drops. And I cannot stress enough that you must do this only outside the bottle, rather than dyeing the whole bottle!)
4. For ideal color observation, make sure you do the repair in the middle of the day, when the sun is at its highest point in the sky. Open all curtains and blinds to let the natural light flow in.
Of course this method will require a bit of trial and error, but you’ll likely be able to get very close to your match.