Well, the problem is mixing different brands (and types, acrylic, enamel, etc) of paint is they don't match exactly. I have a large collection of Modelflex, so I'd like to keep it uniform, and replacing all those colors with TCP (or other brand) would be expensive. I'm in the backwater stage of modelling, with only a few small projects to do on layout, track, rolling stock, scratchbuilding. Since N scale uses small amounts of paint per project, I've got lots of the old stuff left. Still, when painting a new car to add to a Passenger consist I'd like the color to match the other car colors in the train. (Tho TRW has this ongoing discussion about "true" matching colors on RR equipment).
