I still find the best stuff to use is good ol' WD40. Apply it liberally, let it soak in a few hours out of direct sunlight and wipe of the excess. It darkens, it evens out and it provides a consistant sheen. Easily applied, doesn't harm paint or plastic and protects from drying out, perfect! Works great on tires, trim, rubber, vinyl, aluminum, everything! Haven't tried it on my breakfast cereal yet...