Do you use Primer on your engine before you paint it?

Well, some one ask for pics so... here they are.
First of all, I'm not a very good painter, second... I've never done this before.
One thing I did find out is what "thin coats" really were. I had some issues I had to fix, not really understanding what "thin" was. I now understand that THIN means THIN!
It's under 60 degrees here now too already so that don't help much either, so I'll just be letting it sit for awhile.
As you see I did use 500 degree primer. We'll see what happens with that.
It didn't seem, at first that the paint wanted to adhere to the primer. That's where the "thin coats" came in real handy and I painted a few layers.
I have to areas to touch up I know. I left the oil pan black. Don't ask me why? I don't think it will look bad. Kind of Halloween looking :)

here it is...

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