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Electrical conducting paint

Car demister panel

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Speedy Builder527/03/2020 12:17:50
2642 forum posts
217 photos

The electrical tab connector has detached from the rear screen heating grid on the car. I have seen a tube video showing a guy soldering it back onto the grid, but I hesitate as I have a concern that the thermal shock may shatter the glass.

Would electrical conducting paint be better with an epoxy coat to make it more secure once the paint has dried.

Anyone had same experience ?

Stuart Bridger27/03/2020 13:25:01
540 forum posts
29 photos

Wow, it must be over 30 years since I used that stuff for the exact same repair. From memory it worked well, I didn't need epoxy on top. Still have a little bottle rattling around in my took box, not sure if it still any good!

noel shelley27/03/2020 13:25:38
1435 forum posts
23 photos

Solder with as big an iron as you can ! In, solder flows and out, quick ! Heater is high current. I would question resistance of the paint which may heat. Best wishes Noel

Robert Atkinson 227/03/2020 13:59:04
avatar
1238 forum posts
20 photos

Assuming the element is on the surface, rather than embedded in laminated glass, the best repair is t use silver loaded conductive epoxy. Not cheap though
https://uk.farnell.com/multicomp/mc002966/epoxy-adhesive-syringe-6ml-silver/dp/2917615?st=ilver%20epoxy

Make sure it says it is ELECTRICALLY conductive, some are designed for thermal conducttivity and may not be good electrically.

Robert G8RPI.

old mart27/03/2020 16:19:23
3886 forum posts
264 photos

I bought some of this, but haven't tried it yet, I am waiting for warmer weather.

**LINK**

Speedy Builder527/03/2020 16:25:49
2642 forum posts
217 photos

This is the video I saw:

de mister repair

old mart27/03/2020 16:50:19
3886 forum posts
264 photos

It looks like you could get away with soldering it, but during this lockdown at present, if the window did shatter, who would replace it?

john fletcher 127/03/2020 18:01:05
805 forum posts

I think I used my 100 watt soldering iron, maybe it was 80 or 90. I warmed up the connector first, then quick dab, job done.I also remember buying some expensive Silver conducting paint, from I think Radio spares now RS for fail rear widow heater and that worked. John

Speedy Builder528/03/2020 16:08:06
2642 forum posts
217 photos

Thanks for the replies, so soldering iron it is, but A) wait for some hot sunshine and B) do it when the auto glass shop is open for business.

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