I am a firm believer that exterior wood should be silver, sunbleached, and admired while not sanding, varnishing or painting. Sorry for your wasted effort.
I am a total convert to this philosophy. Last year I sanded everything on deck and gave it 5/6 coats of Ephifanes. It looked like hell a year later so I sanded everything clean and left it and plan to leave it. Brightwork looks great but till I have paid hands to do it I'm going with the natural look.
Incidentally, I had some "spillage" of the varnish on the fiberglass nonskid. Any good suggestions on how to get it off?