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Consider what you will do to the tube internally, it's hard to spray inside a tube, you may need to use a brush and you can get the same polyurethane in small tins. Most people would think about flocking the interior of the tube, or painting it flat black, or adding baffles; all of which are easier while it is being built. You could seal the interior with the polyurethane and then paint it black but realistically just painting it flat black inside might be enough. I assume the tube is glued up with an adhesive, just make sure the adhesive is not going to be attacked by your choice of finish.
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