A big-leaf maple burl was wood-turned on a VB36 lathe to make a speaker cone for a home music system. The burl started at 600 pounds and was shaped to form a cone about 30″ long and 28″ at the mouth. The inner curve of the cone followed a parabolic shape to a 2″ opening. Part of the challenge was cutting through stones that were imbedded as the tree grew. I hope you enjoy watching something nature grew metamorphose into a pleasant and useful shape.
Shannon from http://www.house-improvements.com shows you how to use a two-component spray