Can this be used to air seal junction boxes?

Yes, this silicone sealant can be used to seal junction boxes.

Any idea on how many 10.3oz tubes I should use for a chimney insert and top plate? Would 1 tube suffice?

I purchased two and I based my decision on my experience of caulking tubs. Our fireplace is hand quarried stone so it isn't as uniform as modern built fireplaces. Also, Lee in mind, that I was using the caulk for fireplace glass doors and not an insert.

Can I use this to install stacked stone inside a metal firebox

Not sure. It does work good as high temp adhesive though in my opinion.

Is this a non Petroleum based silicone? If so will it work with a cast iron boiler?

Yes, this silicone is not petroleum-based and will work on a cast-iron boiler as long as the temperatures do not exceed 500-degrees F.

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🔥 Seal the heat, own the moment!

MULTI USE MASTER - Perfect for fireplace inserts, solar panel repairs, ceramic tile applications, and heat shielding behind stoves.
UNIVERSAL SURFACE GRIP - Bonds seamlessly to glass, metal, plastics, wood, brick, stone, and more—your all-in-one sealant solution.
FLEXIBLE DURABLE SEAL - Maintains a tough yet rubbery texture that flexes with temperature changes, preventing cracks and leaks.
READY TO USE CONVENIENCE - Comes in a 10.3 fl oz cartridge—no assembly or batteries needed, just apply and seal.
HEAT RESISTANT POWERHOUSE - Endures continuous 450°F heat and spikes to 500°F without losing flexibility.

Rutland 500F RTV High Heat Silicone Sealant delivers a flexible, durable seal that withstands extreme temperatures up to 500°F. Ideal for a wide range of surfaces and high-heat applications, this 10.3 fl oz cartridge is the go-to solution for professionals and DIYers aiming to protect and perfect their heat-exposed projects.

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Product Dimensions	4.76 x 4.76 x 28.58 cm; 358 g
Specific uses	Masonry
Item volume	10.3 Fluid Ounces
Dishwasher safe?	No
Is assembly required	No
Batteries required	No

Rutland Products500F RTV High Heat Silicone Sealant, 10.3 Fl Oz. Cartridge, Black

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