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, 14 Gram Kit (8331D-14G)

Product ID: 580590147

Details

Brand
MG Chemicals
Item form
Liquid
Material
Epoxy Resin
Special features
Strong
Specific uses for product
Electronic

⚡1.8 x 10⁻³ Ω·cm resistivity

🔥Heat cure boosts conductivity

🕒20 min working time

Description

⚡ Electrify your repairs with silver-strong precision!

PRECISION CONDUCTIVITY ⚡ - Achieve ultra-low electrical resistivity for flawless connections every time.
PRO GRADE RELIABILITY 💼 - Strong, permanent electrical connections trusted by professionals for critical repairs.
ROOM TEMP CONVENIENCE 🕒 - Work confidently with a 20-minute open time and easy room temperature cure.
THERMAL SMART BONDING 🔥 - Heat cure option enhances thermal conductivity and bond strength on sensitive components.
VERSATILE SUBSTRATE ADHESION 🧩 - Bonds seamlessly to glass, soft metals, and plastics—no soldering limits.

MG Chemicals 8331D Silver Conductive Epoxy Adhesive is a high-performance, silver-filled 2-part epoxy designed for permanent, low-resistance electrical connections. With a resistivity of 1.8 x 10⁻³ Ω·cm and thermal conductivity of 1.5 W/(m·K), it replaces solder for heat-sensitive electronics and bonds to diverse substrates like glass and plastics. Featuring a 20-minute working time and room temperature cure (with optional heat cure for max conductivity), this 14-gram syringe kit delivers professional-grade adhesion and reliability for precision electronic assembly and repairs.

Specifications

ASIN	B08K3TG5D9
Best Sellers Rank	#16,428 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #55 in Epoxy Adhesives
Brand Name	MG Chemicals
Color	Silver
Compatible Material	Glass
Container Type	Syringe
Customer Reviews	4.4 4.4 out of 5 stars (145)
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
Number of Packs	1
Number of Pieces	2
Other Special Features of the Product	Strong
Part Number	8331D-14G
Specific Uses For Product	Electronic Component Bonding, Assembly
Tensile Strength	1885 Pounds Per Square Inch
UPC	779008833537
Viscosity Level	Medium to High
Volume	6 Milliliters
Water Resistance Level	Not Water Resistant

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