I am in the process of applying four coats of oil based Varathane semi-gloss floor finish on a newly installed white oak floor. I have applied the first coat, and with the temperture inside the house at 65 degrees, the stuff is dry to the touch after 24 hours, but after 50 hours I still cannot sand it without gumming up sandpaper or sanding screens. From what I have read, the finish should be dry enough that the sandpaper should create dust, and not gum up. I was going to rent a screen buffer to do the whole floor, but at this point I have no idea when it might be dry enough for me to do this. Anyone have experience with using oil based polys during the cooler months of the year, and how long it takes the stuff to dry enough to sand it? I can use sandpaper, screens, and steelwool to kind of knock off the dust specks and general roughness, but it is not at all like sanding on a finish that is truly hard and set up. Even if I really cranked up the furnace, could I expect the stuff to get hard without it taking many days for that to happen?