Rear Window Defogger System: Repair

Clean the broken portion with alcohol or appropriate cleaning solvent.
Mask both side of wire with masking tape.
Apply the conductive silver composition to the broken portion.
Conductive silver composition:

By Permatex

QUICK GRID

Fig 1: Applying Conductive Silver Composition To Broken Portion
Courtesy of SUBARU OF AMERICA, INC.
Dry using a dryer after applying the composition.
After repair, check the wire.