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.
Because the first coat of polyurethane filled most of the pores in the wood's surface, the second coat won't have as much to cling to. To help the second coat stick to the first, use #220 sandpaper to make tiny scratches in the hardened first coat. This technique is called scuff sanding.