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.

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Description

🛠️ Fix it fast, fix it strong, fix it smart.

PRECISION FINISH - Fills gaps without shrinking and can be drilled, sanded, threaded, or filed once cured for seamless results.
UNMATCHED STRENGTH - Delivers a rock-solid 4500 PSI bond that outperforms welding or brazing for multi-metal repairs.
MULTI METAL MASTERY - Bonds aluminum, brass, chrome, copper, iron, stainless steel, and steel—perfect for complex assemblies and repairs.
RAPID 4 MINUTE CURE - Get back to work fast with no clamping needed—epoxy sets in just 4 minutes.
ALL WEATHER DURABILITY - Water and solvent resistant with a wide temperature tolerance from -60°F to 300°F for any environment.

Permatex 84109 PermaPoxy is a high-viscosity, multi-metal epoxy adhesive that sets in 4 minutes without clamping, offering permanent strength up to 4500 PSI. Resistant to water and solvents, it withstands extreme temperatures from -60°F to 300°F. Ideal for bonding, sealing, and repairing rigid metals with a smooth, gap-filling finish that can be drilled or sanded after curing.

Specifications

Brand	Permatex
Material	Epoxy Resin
Item Form	Paste
Color	Grey
Item Package Quantity	1
Package Information	Syringe
Item Volume	0.85 Fluid Ounces
Viscosity	High Viscosity
Full Cure Time	4 Hours
Water Resistance Level	Water Resistant
Tensile Strength	4.5E+3 PSI
UPC	686226841094
Number of Pieces	1
Global Trade Identification Number	00686226841094
Manufacturer	Permatex
Model	84109
Item Weight	2.4 ounces
Product Dimensions	1.13 x 3.81 x 8 inches
Item model number	84109
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	84109
OEM Part Number	84109

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