Sand the scratch out gently using fine sandpaper. Recoat with a polyurethane floor varnish matched as closely as possible with the colour of the bamboo (you can use an artist brush if its small). Sand gently between coats to provide a key.
To minimise scratches in the future you can varnish the whole floor a couple of times if you wish.
zentus, July 2009
Replace with an other floor, bamboo is trash.
I did my basement lasdt week.. Its ready to be replaced
2 weeks later.......... dogs kids shoes everthing puts a SCRATCH on this floor ... Bamboo is trash