The only thing that will give the "wet look" is spar eurathane made by Minwax. Only thing is it is not made for decking, but doors/siding & such. I have done it & it did look really nice for awhile, but wore off fast. You'll get a worn path & the edges will stay nice longer. Don't try the poly, it will crack & peal.

agreed. the helmsman spar urethane will work on spindles and rails, but is not designed to tak foot traffic. Frankly, the only floor grade exterior urethane I know of is by sikkens. Its a true marine grade urethane so It'll last, but It'll run you about 80$ a QUART. not cheap, also, this stuff is going to be real, real slippery, especially in the rain and snow, even with shark grip or some other additive it's not really safe either, just some fyi's