From: john@sugarbit.com   
      
   You want open cell foam.  Never rely on an LLM getting the facts right.   
      
   Most rubber formulations are slightly denser than water.  However open   
   cell foam may retain sufficient air to reduce the average density to   
   less than that of water.  If that turns out to be a problem try   
   attaching the foam to something such as a rubber anti-skid mat.   
      
   Have you considered using a folded up towel?   
   --   
   John Hasler   
   john@sugarbit.com   
   Dancing Horse Hill   
   Elmwood, WI USA   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)