DIY spray painting

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Got myself a 2 post lift now and want to make it look nicer as it just needs a fresh lick of paint.

How shall I go about this.

I can either brush it on, spray can it on or buy myself a cheap air spray gun to use with my air compressor?

What do you guys recommend? If I go with the air gun method, what sort of paint do I need?

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Any particular paint recommended?

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Would hammerite be up to the job?