I've used VHT on motors with good results.

And Rustolium makes nice Premium satin black that goes on nice for a rattle can. I used it on my 87 car. Took 12 cans to finish. Probably could have done it with 9 or 10,.. but I screwed up doing the hood and had to sand it back down and redo it.

I found when painting outside,.. its best to do it in the morning. For some reason,.. the wind picks up after 1 or 2pm and makes it difficult to paint evenly.

Hurst