How I repaired the damaged rear defogger grid lines on my Maruti Fronx

I used a small paint brush and applied it on the damaged grid lines with some overlapping onto the existing good grid lines by approximately 5 mm to 10 mm.

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During the rains, I tried the rear defogger for the first time and did not notice any water drops evaporating or heating of the glass.

I finally managed to repair the rear defogger grid lines of my Fronx.

After so much research, I bought a small bottle of Electrolube SCP (Silver Conductive Paint) from RS Components which can be applied on a variety of substrates, including plastics, paper, wood, textiles, glass, ceramics and metals. The part number for the 3g bottle is SCP03B and the cost is around Rs.2,549/- including GST. I am attaching the datasheet of this product.

In the below photo, I have masked the open glass areas and you can see the grid line that has been damaged is in light brown colour.

Following is the procedure that I follow in applying this silver conductive paste (SCP):

• Clean the inside of the rear glass properly and carefully in the horizontal direction (same direction as the grid lines). No dust or fingerprint should be visible.
• Apply the masking tape on the open areas around the damaged grid lines.
• Use a small paint brush and apply it on the damaged grid lines with some overlapping onto the existing good grid lines by approximately 5mm to 10mm.
• Wait for 5 mins to 10 mins for the SCP to dry.
• Apply the second coat and again wait for 10 mins for drying.
• Finally apply the third coat and wait for 30 mins for full dry.
• Remove the masking tape.
• Clear the excess spread out SCP using isopropyl alcohol carefully. In the first few damaged grid lines, I did not press the masking tape fully so the SCP got spread a little.
• Do not turn ON the rear defogger for 24 hours to 48 hours as the SCP required sufficient time for curing.

Note: You can also follow the procedure provided by the Frost Fighter Defroster Grid Repair guide.

After applying the Electrolube SCP (inside view)

After applying the Electrolube SCP (outside view)

After removing the masking tape (inside view). Here you can see the SCP has got spread out a little

After removing all the masking tape (inside view). I have cleaned the SCP immediately using isopropyl alcohol.

I should have made the width smaller / thinner, instead of thicker.

Since this is SCP is silver in colour, it's a little distraction when seen from the outside.

I did not get the rains in the next few weeks. But after a month, there were rains and I was able to test it and all the grid lines were working as the fog got cleared within 5 mins.

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