Absent-Minded Professor, The (1961) -- (Movie Clip) I Dub Thee Flubber! 1  A discouraged Professor Brainard (Fred MacMurray) suddenly discovers he's invented flying rubber, thus flubber, in Walt Disney's The Absent-Minded Professor, 1961. > Play Now Absent-Minded Professor, The (1961) -- (Movie...
Step 3: Sand with 500-Grit. Attach a strip of 500-grit wet sandpaper to a hand-sanding block. Hard rubber sanding blocks work best. Dip the block into the soap and water solution. Sand the wood lightly with a circular motion. Continue dipping the block into the water to keep the surface of the wood wet.
Sand polyurethane lightly between coats with 220- or higher-grit sandpaper. You should see a fine, white powder after sanding -- if not, allow it to dry longer between coats. For the smoothest finish, wipe the surface with a sticky tack cloth before adding another coat.