I used Eastwood Diamond clear satin on all bare metal that was suppose to have a natural look. I tested on old brake lines and compared after painting and couldn't tell painted from non-painted. The hood release cable, hood latches,fuel lines,brake lines,clutch linkage, steering coupler,and I even went back and sprayed some in the lid and painted all the zinc bolts by hand after everything was tightened.

Hardest part is it's hard to see when you spray it on and you have to be careful and trust yourself so you don't over apply and case drips and cloudiness. Just use several light coats.