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

Brand	J-B Weld
Specific Uses For Product	DIY Auto Repairs, DIY Home Repairs
Material	Steel
Item Form	Gel, Liquid
Special Feature	High-Strength
Color	Grey
Item Package Quantity	1
Package Information	Tube
Item Volume	2 Fluid Ounces
Viscosity	Moderate to High Viscosity
Full Cure Time	24 Hours
Water Resistance Level	Waterproof
Tensile Strength	3960 PSI
Unit Count	2.0 Fluid Ounces
UPC	043425700018 043425006554 434258265582 088022145435 718767917027 971473137824 700736731055 043425826558 088020712301 014444924532 635665203666
Number of Pieces	1
Global Trade Identification Number	00043425826558
Manufacturer	JBWeld
Model	JB WELD EPOXY
Item Weight	0.32 ounces
Product Dimensions	0.3 x 5 x 8 inches
Item model number	8265S
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	8265S
OEM Part Number	20-1623
Special Features	High-Strength
Lift Type	....
National Stock Number	8040-01-590-1896, 8040-01-616-0444

J-B Weld8265S Original Cold-Weld Steel Reinforced Epoxy - 2 oz.

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