I am after ideas on finishing a rough old bit of oak flooring which is going to be in a bathroom for the first time. I'll grab some better photos later, but here is an idea of the issue:
Most of the floor is raw unfinished and quite crude floorboards. You can see I have patched in some new oak boards. Some of the floor is black, where it abutted a patch that was covered with lino. I am not sure whether this is a varnish, a stain, or a tanin reaction. Frankly, I'm not much bothered what this ends up looking like, but I want a practical useable bathroom floor, and I think that means it will need sealing with something. What do you suggest?
I also have a variety of gaps and splits which need filling, and I was wondering about using putty. I know it dries a bit too hard, and something flexible would be better, but I can't think of anything else. Again, I'm open to suggestions (and indeed, suggestions as to where to buy putty these days!).