I can vouch for Frostfighter too. When I bought my '02, the owner felt he had to disclose that the rear defog didn't work. It turned out to be one of the least expensive repairs. Done in August, still working 5 months later.
I think soldering must be done to the metallic "bus" on the rear window. If that "bus" is damaged, I believe the only repair is the Frostfighter. After cleaning up an area of about 1" square, where there was visible damage and evidence of a previous repair attempt, I used lots of the Frostfighter on the base. I then added even more, but covering the base of the tab. This was to ensure good electrical conductivity between the tab and the wire.
Larry