Can I use it to repair cracks inside fireplace? The front piece behind the screen has a couple of cracks in the block. Can this be used to repair it?

I did not use this product in that way, but, from my experience with the product, I would not hesitate to try it. Of course it would only work for small cracks and it might be tricky to be sure you get an airtight seal if that's what you need. For the record, I used it to repair a broken "bakelite" handle on a stovetop pot and it has held for a long time through many uses. Good luck.

Can I use just a little bit and store the rest>? How long will it keep if stored after being opened?

This a two part epoxy, so when you take the roll out of the tube it comes in there will usually be aluminum caps at the ends. Leave one alone and peel the other one of the roll and save it. You will use it to seal off the open end. I like to cut my rolls with a very sharp razor. The act of cutting a piece off for use will squish the roll where you are cutting it, and, of course, this will activate the epoxy were it comes in contact with the hardener. Just slap the aluminum end back on and store it a cool dry place. I've held on to mine for over two years now and its is a little harder to mix now. But it still works.

What color does it dry? Dark brown? Medium brown? Tan?

Mine dried a lighter brown than it looked in the package. The inner core is lighter, so when the putty is mixed it dries to a light/medium brown. It's pretty easy to work with and sticks well to metal.

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PC-Fahrenheit Hi-Temp 1 oz Epoxy Adhesive, Brown (25543)

PC-Fahrenheit Hi-Temp 1 oz Epoxy Adhesive, Brown (25543)

Product ID: 6483291

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Details

Brand
PC Products
Specific Uses For Product
Repair Steam
Material
Epoxy Resin
Compatible Material
Automotive
Item Form
Stick

🔥500°F resistance

⏱️60 min cure time

🛠️Hand moldable

Description

🔥 Stick with the Best for High-Temp Repairs! 🔥

DURABLE FINISH - Sand, drill, prime, and paint for a seamless look.
USER FRIENDLY DESIGN - No mixing or tools required—just mold and apply!
RAPID REPAIR SOLUTION - Get back to business in under 60 minutes.
VERSATILE APPLICATION - Perfect for automotive, plumbing, and grill repairs.
UNMATCHED HEAT RESISTANCE - Withstands up to 500°F for extreme applications.

The PC Products PC-Fahrenheit Hi-Temp Epoxy Adhesive is a powerful, hand moldable epoxy putty designed for high-temperature applications, offering exceptional heat resistance up to 500°F. Ideal for quick repairs on steam pipes, radiators, and automotive components, it cures in less than 60 minutes without the need for mixing or special tools, making it a go-to solution for professionals and DIY enthusiasts alike.

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