Yes, this has been grain filled with ebony timbermate. I laid it on quite thick and ended up leaving it a few weeks. Was like rock when I started to sand it off ! However, when you look closely you can see it really has done a great job. It is amazing how many really tiny holes / wrinkles in the grain there must have been ! The photo is the first sand back with 80 grit. Never owned a bass - this is a bit of an experiment.