For residential applications we recommend a breathable clear coat that provides an excellent balance of strength, cost, and water vapor resistance. Rarely do we stray away form this recommendation for typical foot traffic and uses not involving chemical contaminants or workshop users. The product we found to be best in this scenario is a nearly zero odor water borne methyl methacrylate based acrylic polymer. It is UV resistant, scratch resistant, an is quite glossy in appearance. It can be toned down in gloss by applying a matte or satin wax over it.
For more demanding applications we recommend a polyaspartic clear coat. You can't get much more industrial than that and with some aluminum oxide powder broadcast into it the strength of your floor will be near bulletproof.