Original floor was covered with two linoleums, one over the other, and there was a 1/4" plywood under them...All that was wet...And the base wooden floor, under the fiberglass coating was wet too. I had to take out all that, and let the floor to dry. Then, I painted it and added a 5/8" plywood over. I covered it with oak finished floating planks. Later, I found the source of humidity : a leak around shower/toilet window that allowed water to enter between the two fiberglass walls and to get down in the floor .