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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Rutland Black High Temp Silicone Sealant RTV Gasket Maker - Heat Resistant Glue & Black RTV Silicone Sealant Adhesive, Gasket Sealer 500F

Product ID: 5581307

Details

Brand
RUTLAND
Item dimensions L x W x H
1.88 x 1.88 x
Material
Silicone
Style
Industrial
Water Resistance Level
Waterproof

⛽Fuel & chemical resistant

🔥Withstands up to 500°F

🛠️Professional-grade gasket maker

30303CFA

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Description

🔥 Seal the deal with Rutland – where heat meets unbeatable hold!

EXTREME HEAT DEFENSE - Engineered to endure scorching temperatures up to 500°F, perfect for high-stress engine parts.
MULTI SURFACE MASTER - Bonds metal, aluminum, composites, and more—your go-to high-temp adhesive for automotive and industrial use.
DURABLE CRACK RESISTANT - Cures into a tough black silicone gasket that won’t shrink or crack, trusted by pros and DIYers alike.
CHEMICAL RESISTANT FORMULA - Resists gasoline, oil, coolant, and transmission fluids to maintain a reliable seal in harsh environments.
VERSATILE AUTOMOTIVE SEALANT - Seals exhausts, valve covers, oil pans, and more—replacing traditional gaskets with a flexible, durable bond.

Rutland Black High Temp Silicone Sealant is a professional-grade RTV gasket maker designed to withstand extreme temperatures up to 500°F. Its advanced formula resists fuels and chemicals, creating durable, crack-resistant seals on metal, aluminum, and composite surfaces. Ideal for automotive engine rebuilds and industrial applications, this black silicone adhesive replaces traditional gaskets with a flexible, long-lasting bond trusted by mechanics and DIY enthusiasts.

Specifications

ASIN	B000RPW2W2
Best Sellers Rank	#17,153 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #58 in Silicone Adhesives
Brand Name	RUTLAND PRODUCTS
Color	Black
Compatible Material	Metal, Masonry, Wood, Ceramic, Glass, Plastic
Customer Reviews	4.6 4.6 out of 5 stars (708)
Global Trade Identification Number	00022624000761
Included Components	Rutland 500 Degree RTV High Heat Silicone (Black) 10.3 Oz Cartridge
Item Dimensions	1.88 x 1.88 x 11.25 inches
Item Form	Liquid
Item Type Name	High Heat Silicone Sealant
Manufacturer	Rutland
Material Type	Silicone
Model	76
Number of Items	1
Number of Packs	1
Part Number	76
Style Name	Industrial
Surface Recommendation	Any
UPC	022624000761 360846298178 360846299199
Unit Count	10.3 Fluid Ounces
Warranty Description	12 month
Water Resistance Level	Waterproof

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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30303CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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