The dye just penetrates a little way into the plastic, so scrapes will show the original plastic color, just like paint does, but it is easy to redye the scrapes.
The best dye to use is Rit Dye More, but the regular Rit dye works as well.
The nylon cage on the Ryft takes dye really well. We two-toned ours. That blue looks awesome! Enjoy the build! One of my all time favorite builds for sure. And that is saying a lot!
Oh, and if you do the two-speed, make sure you get the shift fork the correct way. It doesn't show it AT ALL in...