Rear Window Defogger System: Repair

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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.
Preparation items:

Conductive silver composition: Permatex QUICK GRID

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