Hi Andrew,Just to add to what CNKS said: A tack rag is a thin "cheesecloth" material that is about a foot and a half square and has a very sticky surface. It is used to wipe over a surface to pick up any remaining dust or dirt before painting. I know you can buy tack rags in an automotive paint supply store, possibly elswhere also. If you have a NAPA store near you, they would have them. Sometimes you buy them in a box of a dozen or so but they can also be available individually. They are not expensive. I don't do any wet sanding at all except for color-sanding with very fine grits - and even that not in many years. Dry sanding with 400 grit should be fine for your primer, but you can wet sand if you wish - it's a preference, not a requirement. It may be helpful with some types of sandpaper to minimize loading but I just don't bother with it. If you are going to apply two coats of primer, I would do them consecutively with no sanding in between, unless the manufacturer's instructions indicate otherwise. As to color coats, I also would apply them consecutively unless stated otherwise on the can label and with no sanding between coats. If the time between coats is not indicated on the label, typical times for enamels would be 15 to 20 minutes but can also be determined by a light finger touch. I wouldn't proceed with the next coat until such time that a light finger touch indicated a tacky surface - on an edge or someplace where it wouldn't show. Unhardened enamels may or may not have a recoat problem if allowed to dry and another coat added later. See your can label for any caution in this regard. See CNKS's reference to a supplied air breathing system. I assume you are not going to use a hardener additive. If that's true, you should not touch any sandpaper of any grit to the final color coat. You will destroy the gloss and not be able to recover it fully by compounding later. The paint film simply is not hard enough to do that. What you see is what you get after that last coat is applied. I wouldn't even use a mild polish for several months. And keep any gasoline spills off it or you will likely be very disappointed. With hardened enamels the situation is different but I don't think we are talking about that here.  Rod
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