[Lady72nRob71]

I have heard that POR15 IS the best to use. They have a good website at POR15.com. Some of their paint can be applied right over rust (after the loose stuff is removed).

They also have "chassiscote black" that can be applied that mimics the factory semigloss (but is too shiny IMHO.)
If you look through some of the pictures in my link below, you can see some before and after results. I used the standard clear and the chassiscote. This was my first experience with POR15. I did not use all their prep chemicals, as I cleaned it all with other stuff. The directions even said some of it can be put on right over rust. Bare metal may be another story. Download their instruction sheets and go by them.

Use cheap disposable brushes, as cleaning them is impossible. Wear thick nitrile gloves and old clothes. If you get it on your skin, you will have to wait 2 weeks for it to wear off. It is like painting with epoxy. The fumes are not too objectionable and do not accumulate too bad in an enclosed garage (though I would not recommend that.)
If you get POR15, try getting the small cans - they are convenient.