Featured in our "bamboo rod restoration" videos this bag of rotten stone is key to getting a glass smooth finish when using spar varnish or tru-oil. Quality rotten stone is expensive and generally sold only by the pound. Our bag is the perfect size for polishing 6-10 rods. You can use this compound with either water or oil to polish out a finish. We also include a half piece of quality 400 grit sandpaper. This is enough to sand out 6-10 rods.