- Body filler is used to level the surface after the metal work has reduced the damage to slightly uneven metal.  After

  straightening the metal is usually ground with a grinder in order to clean the metal and give it some "tooth" so that the
  filler can bond well with the surface.

- After the application of the first coat of filler the spreader is cleaned and the filler is allowed to get about as hard as
  cheese at which time it's easily leveled or shaped with a "cheese grater" blade then allowed to fully harden then it's
  block or board sanded to finish the leveling process.