here is a non clear coat 1985 honda prelude that had been sitting next unifab for six months. It's my work car now. Hey it was free. I used the blue clay and yes it slowly turned red but it took a long time to turn color, and only if I used the same piece of clay too long. It took a serious rubdown to get it to look the way it does now. I mean like two or three days.
clay removes paint if you want it to, and it doesn't if you don't.
It depends on how you use it. that's my .02
