Quote Originally Posted by AllanS
With bare plastic, vinyl dye (for car seats- comes in a spray can) works amazingly well, but I haven't seen how it handles heat under the hood. It almost seems to sink into the plastic, and is very hard to get off. You have to be careful when spraying it though- the surface has to be clean, and you have to do very fine mist coats, and lots of them. Otherwise the surface will crack, or you'll get an orange peel effect. I used vinyl dye to coat the plastic face of my head unit in my last car- it was grey and didn't match the black of the e34. It gets in all the small crevices of the surface, like a very thin paint.