Does this epoxy do well in heat? Specifically exhaust/muffler heat?

I used to heat to remove the epoxy when it didn't hold as well as I had hoped. I don't think this would work with a muffler.

What material would be best to mix this on?

I use piece of cardboard. It works, though it’s a pain mixing it. Make sure u mix it well.

will this fill pinholes in welding? I am looking for a product that will easily fill the little pinholes and look (and react) a lot like the steel

Great question. I think it could fill the pinholes, but am unsure if it will look like the steel. You may try painting over with matched color.

Can it be used for a/c aluminum coils repair with 410A refrigerant?

No, It really doesn't work ona lot of items. We tried.

Permatex 84109 PermaPoxy 4 Minute Multi-Metal Epoxy, 0.84 oz

Product ID: 279018883

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Details

Brand
Permatex
Item form
Paste
Material
Epoxy Resin
Special features
Eliminates or
Specific uses for product
Metal bonding

⏱️4-minute set time

🌡️-60°F to 300°F temp range

🛠️4500 PSI tensile strength

Description

🛠️ Fix it fast, fix it forever—no welding required!

GAP FILLING POWER - Fills cracks and gaps with no shrinkage; sand, drill, or thread after curing.
MULTI METAL MASTERY - Seamlessly bonds aluminum, brass, steel, and more—ditch welding for good.
RAPID 4 MINUTE CURE - Get permanent, high-strength bonds without the wait or clamps.
ALL WEATHER RESISTANT - Water and solvent resistant for durable repairs in any environment.
PRECISION APPLICATION - Syringe delivery ensures mess-free, exact placement every time.

Permatex 84109 PermaPoxy is a versatile, dark gray epoxy adhesive that sets in just 4 minutes without clamping. Offering up to 4500 PSI tensile strength, it bonds a wide range of metals including aluminum, brass, and steel. Resistant to water, solvents, and extreme temperatures (-60°F to 300°F), this gap-filling epoxy can be drilled, sanded, and machined once cured, making it the ultimate quick-fix solution for professional-grade metal repairs.

Specifications

ASIN	B000ALDXV2
Best Sellers Rank	#72,185 in Automotive ( See Top 100 in Automotive ) #269 in Automotive Fillers, Adhesives & Sealants
Brand	Permatex
Brand Name	Permatex
Color	Dark gray
Colour	Dark gray
Compatible Material	Aluminum, Brass, Chrome, Copper, Iron, Stainless Steel, Steel
Container Type	Syringe
Customer Reviews	4.4 out of 5 stars 2,366 Reviews
Full Cure Time	4 Hours
Global Trade Identification Number	00686226841094
Included Components	Permatex 84109 PermaPoxy 4 Minute Multi-Metal Epoxy, 0.84 oz.
Item Form	Paste
Item Package Quantity	1
Item Type Name	Adhesives
Item Weight	0.15 Pounds
Item form	Paste
Manufacturer	Permatex
Material	Epoxy Resin
Material Type	Epoxy Resin
Model	84109
Other Special Features of the Product	Eliminates welding or brazing, water and solvent resistant, gap filling
Special features	Eliminates welding or brazing, water and solvent resistant, gap filling
Specific Uses For Product	Metal bonding, filling, and sealing
Specific uses for product	Metal bonding, filling, and sealing
Tensile Strength	4500 Pounds Per Square Inch
UPC	686226841094
Unit Count	25 Milliliters
Viscosity	High Viscosity
Volume	0.85 Fluid Ounces
Water Resistance Level	Water Resistant

Reviews

M**Y

Permanent Bond

6.01.2026

M**H

Nice.

13.11.2024

E**S

Excellent product

19.05.2023

S**.

12.11.2024

K**N

Metal weld

4.10.2025

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