How serious are you about this? By that I mean how rich and authentic, and can you "see" vintage colors as they should be. The majority of Mandarin Maroons are made with oxide tints and toners. Things changed drastically in refinish materials and the depth of finish is taking a back seat to durability. New formulations lose the depth outdoors and take on a plastic, almost opaque plexi look. You can combat this, not everybody cares, but if you ask a supplier to make the color with transparent tints vs oxides where possible the difference is astounding. Also, paint the color over a minimum of red oxide sealer or even better a coat of even black 1st. Don't feel bad if you can't see the difference or don't care, this exercise isn't for everyone. If you get a couple pint samples and experiment it might be worthwhile. And no, I don't think a gallon is enough if you do a single stage finish that will be sanded and polished. 3-4 coats are required and you'll remove 1 full coat in the cut and buff stage. Also, since all of these colors are not "off the shelf" any longer you'll want an extra qt just for repairs in the future without the angst of color matching. I'd suggest 6 total for single stage. VENTILATE AND WEAR A RESPIRATOR. Step out between coats for fresh air too. Your car isn't worth a broken fingernail, so surely not worth getting a sensitized urethane reaction to your lungs.