Painting of Engine Bay, What all do I need? Options

[RustyWa]

I'm getting close to the painting stage of my engine compartment update. I would like some suggestions on what type of paint I should use.

I stopped at the local paint supply store, they sell PPG products, and talked with the guy there. I'll need to do some spot priming of the bare metal, so he suggested a self-etching primer in a can, an SEM product I believe. For the paint, my car is green metallic, he suggested using a single stage paint. He said a quart of the PPG MTK ($20-$30) which is an acrylic urethane should work good for the engine compartment. (IMG:style_emoticons/default/confused24.gif)

He also said I would need a catylist ($13) and reducer ($20).

So how does this sound for a metallic paint application in an engine compartment?

Also, I will need to weld in a new battery tray/support and a new engine lid hinge bracket. How critical is it to spray weld-thru primer onto the car where these pieces will be welded to? The weld-thru primer at the autobody store was like $20....and I'm such a cheap bastard.

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Thanks