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

Product ID: 279018883

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

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109.12 DT

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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	#68,675 in Automotive ( See Top 100 in Automotive ) #267 in Automotive Fillers, Adhesives & Sealants
Department	unisex-adult
Item model number	84109
Manufacturer	Permatex
Product Dimensions	2.87 x 9.68 x 20.32 cm; 68.04 g

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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109.12 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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