Will this work to coat the non-working rubber buttons on a remote control

Yes, this worked great. First, clean the circuit board where the contacts are using Isopropyl alcohol. I also used Iso to clean off the rubber dot, which is usually a conductive carbon substance. Then apply the *carbon* version of this product to the black dot. Cover the whole surface and let it dry completely before re-assembling.

Can this be used to repair a broken strip in a car rear defogger?

I just tested a 1/2" long x1/8" wide strip on a piece of pyrex glass and got 0 resistance for that length. It seems to conduct well for a short distance and stuck to the glass very well. I hope this helps.

Does it work for making a PCB?

In my opinion, it's far from the ideal for making your own PCB. I can see it being used for prototyping of low voltage/low current circuits.This particular compound is based on nickel, which is not a as conductive as copper.This pen would work fine for the small repairs like cuts or tears in the existing PCB traces. BTW, there's a more conductive version of this pen which is based on silver.Aside from conductivity issue, there's an issue of securing parts to PCB. I,also, doubt you can solder to the trace drawn with this pen.

Is this pen good for making a jumper on a circuit board?

Yes, it's great for that but even the carbon conductive (lowest quality) pen would work for that

Mg Chemicals 838ar P Total Ground Carbon Conductive Pen 4g

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Description

⚡ Fix, create, and innovate with conductive confidence!

RAPID DRYING FORMULA - Get your projects moving fast with a quick-dry acrylic polymer that sets in minutes.
CONTROLLED FLOW VALVE TIP - Squeeze to regulate paint flow for clean, consistent conductive paths every time.
VERSATILE SURFACE ADHESION - Bonds seamlessly to plastics, metals, ceramics, and even 3D printing materials like ABS and PLA.
COST EFFECTIVE CONDUCTIVITY - An economical alternative to silver or nickel paints for prototyping and repairs without sacrificing quality.
PRECISION CONDUCTIVE TRACES - Draw reliable, corrosion-resistant connections with a fine 1.0 mm line width.

The MG Chemicals 838AR-P Total Ground Carbon Conductive Pen delivers fast-drying, corrosion-resistant conductive traces with a low volume resistivity of 0.46 ohms·cm. Its valve tip and soft tube design allow precise flow control, making it ideal for repairing or prototyping on a wide range of substrates including plastics, metals, ceramics, and 3D printing materials. Perfect for professionals and makers seeking a reliable, cost-effective solution to restore or create electrical connections.

Specifications

ASIN	B01LZX06PL
Best Sellers Rank	#154,321 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #67 in Electrically Conductive Adhesives
Date First Available	September 24, 2016
Item Weight	0.387 ounces
Item model number	838AR-P
Manufacturer	MG Chemicals
Product Dimensions	3 x 1 x 8 inches

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