I apply poly to an outdoor pine pic table every o/ yr for fifteen. Alwasy been fine until last yr. I will not use hi-gloss on an outdoor in sun table top anymore. killer glare.
anyways last time, i got a haze. tried sanding, fine snading, tried polishing compound. It was the conditions. Humidity. It was very very humid. The finish looks litterally like milk paint white. Didn't go away. Did when you wet it down. Didn't want to waste $ so I left it. Its permanent. Prob have to sand down nearly, if not ALL the way. ALL. It has a yr on it, and it is fading, as the finish is also, fading. Gonna need to do it again soon. Going right down to bare wood, or close.
Do not apply this stuff when humid. Its ruined, In my case; you may have o/ going on.
I asked in alt.construction, or some o/ group like that, and they all reccomend proruct called froggy, or something. They didn't like regular poly at all. Only happened to me once. It was like 90RH.