I have installed a new pre-finished engineered wood floor and am trying to put poly on to help protect. I followed floor makers recommend and am using varathane water based. It is ugly. I have put on 2 coats and sanded between after 24 hours. I have bubbles, voids, streaks and anything else you could imagine. It looks like elephants have run across the floor. Varathane is clueless as to why. I can only sand so much before having to stain the floor. Help.