That was my wood choice for carving paddles John, though
      Greenland style, both for it's extreme lightness and as a
      relatively soft wood.  Excellent workabilty with well sharpened
      tools.   It was not dent resistant, not so much an issue, I
      imagine reasonably strong, but as I mentioned before, I had used a
      shear fiberglass epoxy coating.  this was for additional strength
      and durability rather than water resistance.
    The best part of the wood was that I found it to be dead
      straight  and stable, from a 2x4 through all the cutting and
      carving reductions (unusual in kiln dried wood).  I got to pick
      knot free from the selection, but that seemed to be easier than
      what I find for typical 2 bys- knot free seems to be very resinous
      in that selection.
    I am a bit obsessive about sharp tools (I use a Japenese whet
      stone trio), and it did seem to dull blades as fast as any hard
      wood, I imagine there is a proportional silicone content.
    I wonder what sort of minerals would harbor in driftwood in times
      past and it's affect on cutting tools?