We had our floors refinished and there are still separations between the boards. The company claims that it's due to the original installation of the floor and are not fixing it any further. Is it possible to fill the holes with something that doesn't need to be finished or sanded? The guy recommended painters putty, does anyone have experience with that? Other solutions?
Painter's putty would work, but I don't know if it'd be your best option. First of all you'd need a ton of it to fill between every piece of flooring. Also, unless your going to use it after you put the finish on your floor, I'm not sure that the stain or lacquer wouldn't dissolve the putty. Unfortunately, I don't know what would be your best option, but I couldn't imagine that you should entertain the notion of painter's putty. I could be wrong, though...it certainly has happened before.....once...ha
Those gaps are never to be filled. The seasonal movement of wood will squeeze the putty back out of the gaps. Next heating cycle, the flooring will shrink again and will show the gaps again, looking something like the ragged edges your pictures show. Somebody tried filling the gaps already.... at least that one....
Wood filler can temporarily fill anything, even the annoying gaps that run parallel to the long edges of your floor boards. But the size of those gaps changes all year long and the wood filler in those gaps isn’t elastic enough to swell and shrink with the seasons and so will just get pummeled and eventually break up.