Body work for dummies...

Dan... you missed the obvious.

Adam, when can you come over and help?
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As far as how much to get, ALWAYS overbuy your paint. It will have a mix/reducing ratio. Some gallons of paint will end up as 1.5 sprayable gallons, other as 2 sprayable gallons. Nothing is worse than buying paint, then running out and having to get another batch mixed. Sometimes they aren't the same. If you buy 1.5 gallons, cross mix the paint to get any variation out of the total purchased.