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I have 2012 Volvo S40. At some point, something has scrapped against the window and broken a few of the grid lines. The result is that part of the defroster grid does not work. Most of the window does defrost, it's just around the lines which contain a broken connection that it doesn't.

How can I fix this? I've seen some conductive paint/glue products to repair the individual lines, but I'm a little sceptical from the reviews of such products. If this is the best solution, I'd appreciate any suggestions of ones to avoid and try.

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DJH
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In addition to Solar Mike's answer, I'd suggest the Permatex Complete Rear Window Defogger Repair Kit. It has worked well for me in the past.

Shamtam
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I did this once, it depends on how thick and wide the original lines are.

I cut back each side to well-stuck lines (does not work trying to join to loose lines), then masked the section that needed replacing, the idea is to get the masked gap to match - if it goes thicker it shows up...

Then I used 3 or 4 coats to build up the section. Whatever you do don’t switch the power on until it has dried thoroughly.

The product I used had a silver content but can’t remember any details...

Solar Mike
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