I worked in a car electroplating and paint factory years ago in the shipping department and we would run a single paint color, then they have to change out that paint to a new color. It’s pretty time consuming to do. I’m not certain if Tesla runs more than 1 color line at a time but they certainly don’t run all five at the same time. Elon has said the paint dept is where everything bottlenecks in the factory. I assume they run several thousand panels of 1 paint color, then switch out the paint. White and MSM are probably their biggest paint runs but there are also more of those on order. If you look at the flyover vids, you’ll see they’ll line up the M3’s (and other models too) in their respective holding lots according to the truck they’ll be loaded on to. The cars sit there until that truck comes to get them. So let’s say they run 1,000 MSM, then 1,000 white, then 500 blue, 500 black, 500 red (then they start over) going to the East Coast and assemble the rest of the car to match the specs ordered. When assembling they pull car parts, including painted panels, from available stock so when they run out of MSM parts before another run of MSM paint, they just assemble other colors until more MSM panels are run. But then the logistics of location come in and they might push some TX orders back from production (even though they ordered first) because they have more going to NY and can send more on the rail to NY all at the same time. That doesn’t take into account things like running out of white seats or 19” wheels before that truck is scheduled to leave for the rail yard and needing to push those orders back so they bump up someone else’s order that they do have available to fill up that truck.
I forgot to include that the assembly process is all run on 1, maybe 2 lines. They just pull the respective parts out of available stock and put the car together. That’s why you’ll see a white car roll out of the factory to the inspection area, then a red car, then 3 black cars, then an msm…not all 1 single color.