Is this product electrically conductive?

No. I saw a video on youtube where a guy made a cylinder head out of jb weld, and it did not ground the spark plug.

block crack between cyls 5 & 7 against the head, at the narrowest point between cyls. both cyls are sleeved. will jb hold the temp without breaking do

thanks gpower. was looking online at the temp ratings of different epoxy products, actually found one @2100F, but with low tensile strength. I would like to stay away from welding as the crack is five eights long and sleeved at each end. just now pressure testing and the waterjacket has held 30 lbs for 12 hrs. I may also entertain some of the hi-tech block sealers, if it continues to hold pressure. thanks again for your input, and wish me luck putting life back in this old hemi. Dean

I have a number of small leaks in an older aluminum boat-- would JB work for a repair on this as a weld/filler for small punctures? thanks

This is a general purpose epoxy that worked great for me on cast iron. It does say you can use it for marine purposes, however you might also consider their product made specifically for water:http://www.amazon.com/J-B-Weld-8277-Water/dp/B000BRQ0TW/ref=sr_1_5?ie=UTF8&qid=1392730373&sr=8-5&keywords=jb+weldor look into the Permatex product made specifically for metalshttp://www.amazon.com/Permatex-84109-PermaPoxy-Minute-Multi-Metal/dp/B000ALDXV2/ref=sr_1_1?ie=UTF8&qid=1392730252&sr=8-1&keywords=metal+epoxy

Will this stop an exhaust leak right where a donut goes flanges off of the manifold? Or which jb weld would work

If your donut is bad you need to replace the donut. JBweld is a metal epoxy, you'll end up creating a permsnent bond wherever you've stuck it to and make it difficult to make a proper repair later without grinding it off. If it's a crack you need to fix, spread it on thick and press in some wire mesh.. Fiberglass style patch. Let if cure and it should be good. Patched some long cracks that way. Hope that helps

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J-B Welding 8280 Yuen - Professional Size Steel Reinforced Epoxy - 10oz 2oz 8265S 1

J-B Welding 8280 Yuen - Professional Size Steel Reinforced Epoxy - 10oz 2oz 8265S 1

Product ID: 725133558

Details

Brand
J-B Weld
Color
Material
Polymer
Special Feature
Heat Resistant
Specific Uses For Product
Industrial

⏳4-6 hours initial cure

🔥withstands up to 550°F

🛠️3960 PSI tensile strength

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Description

🛠️ Fix it once, fix it like a pro!

MADE IN THE USA - Proudly manufactured domestically for trusted quality and performance
UNMATCHED STRENGTH - Rated at 3960 PSI for industrial-grade durability
HEAT RESISTANT BOND - Endures extreme temperatures up to 550°F without breaking down
PRO LEVEL CURE TIME - Sets in 4-6 hours, fully cures in 15-24 hours for reliable repairs
VERSATILE APPLICATION - Perfect for home, auto, plumbing, marine, and craft repairs

J-B Weld TwinTube delivers a professional-grade epoxy solution with a robust 3960 PSI tensile strength, quick 4-6 hour set time, and heat resistance up to 550°F. Ideal for a wide range of repairs from automotive to marine, this 2 oz epoxy is waterproof, sandable, drillable, and proudly made in the USA, ensuring long-lasting, reliable bonds for serious DIYers and pros alike.

Specifications

ASIN	B0006O1ICE
Amazon Bestseller	#1,924 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #109 in Contact Adhesives
Brand Name	J-B Weld
Color	Ntroaterproofme
Compatible Material	Concrete, Stone, Wood
Container Type	Tube
Customer Reviews	4.3 4.3 out of 5 stars (23,837)
Global Trade Identification Number	00043425826558
Item Package Quantity	1
Item Weight	9 g
Manufacturer	J-B WELD CO
Material Type	Polymer
Model	8265S
Number of Pieces	1
Other Special Features of the Product	Heat Resistant
Part Number	8265S
Specific Uses For Product	Industrial, Construction, Hardware
Tensile Strength	5020 Pounds
UPC	043425700018 043425006554 434258265582 088022145435 718767917027 971473137824 700736731055 043425826558 088020712301 014444924532 635665203666
Unit Count	1 Piece
Volume	2 Fluid Ounces
Water Resistance Level	Waterproof

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