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 deal with heatproof confidence! 🖤

HEATPROOF SEAL MASTERY - Endures extreme temperatures up to 500°F for reliable, long-lasting performance.
UNIVERSAL SURFACE GRIP - Bonds seamlessly to diverse materials—metal, glass, wood, plastic, and masonry—unlocking endless repair possibilities.
WEATHER OIL RESISTANT - UV stable and oil resistant formula ensures your repairs stay intact in harsh environments.
DURABILITY MEETS FLEXIBILITY - Creates a tough yet flexible seal that resists cracking and corrosion under stress.
PROFESSIONAL GRADE USA MADE - Crafted in the USA with premium silicone for trusted quality and consistent results.

Rutland 500°F RTV High Heat Silicone Sealant is a premium black silicone adhesive designed for high-temperature applications up to 500°F. This USA-made sealant bonds to a wide range of surfaces including metal, glass, wood, and masonry, offering a durable, flexible, and UV/oil resistant seal ideal for fireplace inserts, solar panels, tile repairs, and more.

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Container Type	Cartridge
Item Form	Liquid
Special Features	Heat Resistant
Specific Uses For Product	Wall Repair, Tile Repair, Masonry, Furniture, Repair
Compatible Material	Metal, Masonry, Wood, Ceramic, Glass, Plastic
Volume	10.3 Fluid Ounces
Item Package Quantity	1
Color	Black
Material Type	Silicone

Rutland 500°F RTV High Heat Silicone Sealant Black, USA-Made High Temperature Gasket Maker Adhesive - UV Stable, Oil Resistant & Non-Corrosive

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