Best I've found is a handled paint scraper with the corners rounded. Sharpen with sandpaper 220 and 400 on a smooth surface. Hold the scraper at about a 45 degree angle.

You should be able to take small shavings off if its sharp. The steel is soft, so you will need to sharpen a lot.

: Looking for some insite, I am in the glassing stage of my Great Auk
: Double. I am having a heck of a time sanding the inside curves
: of the hull. What is the best way to smooth in there? I have
: been hand sanding the curve since the ROS will not conform to
: it. Quarter the way done, and a loooooooong way to go. Thanks
: for any suggestions.