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Since you are going to do this on the cheap (I assume) you can do your firewall etc this way:
Get an angle grinder and a wire wheel. Use that to clean off any rust, old paint, or whatever off. Then wipe everything down with mineral spirits. Then hit it with some rough sandpaper to give it tooth, and use mineral spirits again to get all the dust off. Then use Rustoleum Professional 2177 Semi Gloss to paint.
I've had excellent results with this method.
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