Be aware that sanding the bamboo will change the character of the bamboo since it removes the bamboo’s natural sheen and reduces the nodes. If the bamboo you desire to stain has been left out in the weather for several months, it may have turned a light gray color. Bamboo that has been weathered has lost its tough, waxy outer layer and will readily take a stain, varnish, or paint. Make sure that the bamboo is free of dust before you get started.
If you find that the bamboo is not taking the stain, wipe off the extra stain with a rag and allow the area to dry. Try re-sanding the area and then re-stain.
Work in 6-inch sections, and turn the bamboo as needed. Work all the way around before moving on. Finish with a wax paste to add shine to the bamboo and preserve it.
