Andy Dingley wrote in message
There's only one - Rustin's Floorcoat. Not cheap, but you don't need
many coats (three for a good job, two is almost good enough)
If you want the boards to look just as they were when sanded but with a
total seal against liquids, even one coat works well. I brush as normal and
wipe with a rag to remove the excess. A quick rub down with very fine
sandpaper when dry gives you a sheen. This works well if the boards are a
bit ropey and you don't want to highlight the faults.