How well does this work with ethanol-based fuels?

Absolutely fine. I sealed the steel tank on a 1986 F150 that I fill religiously with 87 10% ethanol. Hasn't leaked in over a year.

How big of an area will one kit repair? Example 4 x 6 inches etc?? Thanks -Mike-

If you need the fiberglass patch, I think it was about 2"x4". If you're just using the epoxy, it will cover more area - probably a 10"x10" area or even larger if it doesn't need to be too thick. Just a word of caution that once you start mixing the 2 chemicals it starts to harden within about 15mins, so you don't have a lot of time to delay. I learned this the hard way. :(

Antique oil lantern with leaky reservoir about 2 inches in diameter. There are several pinholes in the steel. Will this coat the entire bottom?

Yes it should ,but you must make sure it is clean and all the oil is removed. Or it may not stick to metal. . I don't know if it's permanent. I did my gas tank 5 years ago and I see a drop under the car

How well will this product hold up to vibrations? I have a fuel tank on a generator with a crack which meed fixing

I would say pretty well. If properly applied it dries just as hard as regular JB Weld. Used the fuel patch on a tank for an old farm truck, didn't leak for the two years I had the truck.

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🛠️ Fix it once, fix it forever—join the 40-year legacy of unstoppable repairs!

COMPACT READY TO USE - Lightweight 40g kit with easy instructions—repair anywhere, anytime.
COMPLETE PRO GRADE KIT - Includes epoxy putty, fiberglass cloth, sandpaper & applicator for a flawless repair.
EFFORTLESS LEAK FIXING - Stop leaks without removing your gas tank—save time and hassle.
VERSATILITY THAT WORKS - Perfect for gas tanks, oil pans, and metal tanks—trusted by pros and DIYers alike.
UNMATCHED STRENGTH LEGENDARY BOND - World’s strongest metal-to-metal epoxy for fuel tanks and more.

The J-B Weld 2110 Metal Fuel Tank Repair Kit offers a professional-grade, permanent solution for repairing metal fuel tanks and other metal surfaces. Designed for quick, no-tank-removal fixes on holes up to 3/8" diameter or 4" long, this compact 40g kit includes epoxy putty, fiberglass cloth, sandpaper, and an applicator. Trusted by mechanics and DIY enthusiasts for over 40 years, it delivers the world’s strongest bond with easy-to-follow instructions and universal fit.

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Item weight	40 Grams
Fuel type	Gasoline
Product grade	New
Fit type	Universal
OEM part number	JBW2110
Global Trade Identification Number	00043425021106
UPC	043425021106
Automotive Fit Type	Universal Fit
Manufacturer	JBWeld
Part number	2110
Item Weight	40 g
Product Dimensions	4 x 13 x 20 cm; 40 g
Item model number	2110
Color	Gray
Style	Classic
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Power source type	hand_powered
Item Package Quantity	1
Included components	Epoxy Putty^Fiberglass Cloth^Sand Paper^Applicator
Batteries Included?	No
Batteries Required?	No

J-B Weld2110 Metal Fuel Tank Repair Kit, Gray

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