I have bamboo furniture which was purchased about two weeks ago. Since I received it, dark brown spots are starting to appear on the top of the glossy surface of the coffee table. I am starting to wonder if it isn't caused by the gloss that was used, and is causing some discoloration. It is not like the normal color variation seen in bamboo, and like I said, has appeared gradually, is almost like bleeding through. I am wondering, can bamboo be sanded? I am thinking that maybe I can do this to get rid of the dark brown spots, and lightly regloss the area. Any thoughts?