Minwax Fast-Drying Polyurethane
We couldn't put this list together without mentioning Minwax, the biggest name in varnish and stains. While they dont produce a spar varnish, they do produce excellent polyurethane varnishes at a reasonable cost. This is an indoor varnish, designed to provide superior scratch resistance. However, it doesn't work as an exterior varnish, as it is not designed for that. Minwax calls this a fast drying varnish, saying that it can be recoated in four to six hours. However, many other varnishes can be recoated in the same time, so take that name with a grain of salt.