I did mine with 2 Quarts, but I already had a black base. You have to wait 12-24 hrs between coats anyways, so I'd say just go to Home depot, get 2 quarts. You should be able to get at least 2 coats out of quart if there thin enough.

If you're refering to the Hot Hues brand of Hot Rod black, it looks like it's just alot higher end satin black. 2 Part, so it's probably more durrable than rustoleum (and noxious to work with) However, at 7$ a quart for rustoleum, if it gets messed up, just slap another coat down and move on.