Anyone know exactly how conductive this stuff is? Resistivity value?

It's volume resistivity is .0004 ohm-m when cured properly according to the manufacturer.

Can you solder to this epoxy when fully cured?

You should solder first, and then coat with conductive epoxy and cure. The epoxy typically improves the electric contact accomplished by soldering. Good luck!

will a fresh mix of this epoxy bond to the cured epoxy?

I do not know. After a careful reading of the warnings and dangers of this product I put it on the shelf unused. I learned how to solder. Just saying.

Does this stuff ever harden or is it always soft?

The stuff hardens in about 1 hour. It is dispensed from a hypodermic type dispenser and can be mixed with a kitchen knife or small spatula. Have some alcohol readily available to clean up your mixing and apply tool and possibly you. I found that it conducted current quite well. When you are mixing and using this product it reminds me of using bondo.

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MG Chemicals 8331D Silver Conductive Epoxy Adhesive, High Conductivity, 20 min Working time, 2-Part, 14 Gram Kit

Product ID: 235658720

Details

Brand
MG Chemicals
Item Form
Liquid
Material
Epoxy Resin
Special Feature
Strong
Specific Uses For Product
Electronics

⚡1.8 x 10⁻³ Ω·cm resistivity

🔥Cures at room temp or heat for max conductivity

🧪2-part epoxy, 20 min working time

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stick with the best: Conductive epoxy that powers your innovation!

HEAT SAVVY BONDING - Perfect solder alternative for heat-sensitive components—no thermal damage, just flawless adhesion.
PRECISION APPLICATION - Dual syringe system delivers exact 1:1 mix ratio for consistent, mess-minimized use every time.
ELECTRIFY YOUR CONNECTIONS - Ultra-low electrical resistivity ensures lightning-fast conductivity for your critical electronics.
ROOM TEMP CURE WITH A BOOST - Cures at ambient conditions or accelerate with heat for peak performance in just minutes.
VERSATILE SURFACE COMPATIBILITY - Bonds seamlessly to glass, plastics, and soft metals—expand your design possibilities.

MG Chemicals 8331D is a silver-filled, 2-part conductive epoxy adhesive designed for strong, permanent electrical connections with ultra-low resistivity (1.8 x 10⁻³ Ω·cm). It cures at room temperature or faster with heat, bonds to diverse substrates like glass, plastics, and soft metals, and offers a 20-minute working time for precision application. Ideal as a solder replacement for heat-sensitive electronics, this 14-gram kit delivers reliable conductivity and robust adhesion for professional-grade repairs and manufacturing.

Specifications

ASIN	B08K3TG5D9
Best Sellers Rank	#143,369 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #65 in Electrically Conductive Adhesives
Brand Name	MG Chemicals
Color	Silver
Compatible Material	Glass, Plastic
Container Type	Syringe
Customer Reviews	4.3 4.3 out of 5 stars (157)
Full Cure Time	6 Hours
Item Form	Liquid
Item Package Quantity	1
Item Weight	14.4 Grams
Manufacturer	MG Chemicals
Material Type	Epoxy Resin
Model	8331D-14G
Other Special Features of the Product	Strong
Part Number	8331D-14G
Specific Uses For Product	Electronics, Glass, Metals, Plastics
Tensile Strength	1885 Pounds Per Square Inch
UPC	779008833537
Unit Count	1.0 Count
Viscosity Level	Medium to High
Volume	6 Milliliters
Warranty Description	[email protected]
Water Resistance Level	Water Resistant

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