can it be used to help seal cracks in heat exchangers?

I might, however I would not count on this product to protect from the exhaust gases that may pass through the heat exchanger . If possible I would remove the cracked unit and either replace of braze up the crack.

Eletric hot water pot seam is leaking water, Can I use it to seal the seam ?

Just an 80 yr old women to answer: I don't know, It was use on our free standing fireplace for the seam around the door and worked fine. You could probably get an answer from the Rutland company.

I have a crack in the glass could this be used to seal that so it doesnt crack anymore ??

I doubt it but it does harden up pretty good

How long must it be heated to cure? Is the temperature rating continuous duty?

This product must slowly be brought to 500-F over the course of a few hours, and kept at 500-F for an hour. The cement is good for temperatures up to 2,000-F continuously. Here is a link to a video that walks you through the heat-cure. https://youtu.be/9kDHsm0YYHk

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🛠️ Seal the deal with heat-proof confidence!

PRO GRADE FORMULA - Trusted by chimney professionals and homeowners for consistent, season-proof performance.
EFFORTLESS CLEANUP - Water-based cleanup means no harsh chemicals or mess after application.
SEAMLESS AIRTIGHT SEAL - Creates a durable black bond that locks out leaks and withstands weather extremes.
HEAT RESISTANT POWERHOUSE - Endures extreme temperatures up to 2000°F for reliable, long-lasting repairs.
VERSATILE APPLICATION OPTIONS - Available in squeezable tube or caulk gun size for precision or volume use.

Rutland Stove and Gasket Cement Original is a professional-grade, heat-resistant sealant designed to repair stove cracks and leaks. It cures black for a durable, airtight bond that withstands temperatures up to 2000°F. Available in a convenient 2.3 fl oz tube, it offers easy water cleanup and is trusted by chimney care experts for long-lasting indoor use.

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Product Dimensions	3.18 x 5.4 x 19.69 cm; 0.28 g
Item volume	2.3 Fluid Ounces
Dishwasher safe?	No
Is assembly required	No
Batteries required	No
Item weight	0.01 Ounces

Rutland Products Stove and Gasket Cement Original, Black, 2.3 fl oz

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