Rear Window Defogger System: Repair

Clean the broken portion with alcohol or white gasoline.
Cover both sides of the heat wire with masking tapes.
Apply conductive silver composition to the damaged point.
Conductive silver composition:

Permatex
- QUICK GRID
  
  Fig 1: Applying Conductive Silver Composition To Damaged Point
  Courtesy of SUBARU OF AMERICA, INC.
After applying conductive silver composition, dry it using a drier.
After repair, check the wire.