Reserve the smooth edges for joints running across open scen-
        
        
          ery, and hide the rougher edges along the backdrop, fascia. or
        
        
          roadbed. When this is impossible, carefully cut the fabric paral-
        
        
          lel to the threads and/or seal the edges with a little hot glue or
        
        
          white glue to prevent fraying.
        
        
          Applying the plaster
        
        
          We use US Gypsum’s USG Hydrostone plaster [8], because that’s
        
        
          what our local supplier carries. Other similar grades should do
        
        
          just as well. Contrary to model railroad lore, there is only one
        
        
          
            BURLAP HARDSHELL  |
          
        
        
          
            9
          
        
        
          9. Spraying the burlap with wet water primes it to accept the
        
        
          coat of creamy plaster and keeps it from drawing moisture out
        
        
          of the plaster too quickly.