Someone just posted this pic on another site. Based on this I think Fender cleared over the black (it's pretty glossy), I would guess they did the same for the white. If they cleared over the red they steel wooled it and rubbed it out to take off the shine. That's what I'm thinking now. That would allow some aging of each color without the danger of going through the underlying color unless you wanted to. I'm trying it over the next week. I'm sure they used basecoat/clearcoat automotive paint for this project.
Not sure how interested anyone is in seeing the results, but I'll post them anyway.