Can this be used to seal cracks in existing cement between Boiler and Chimney?

Hi, you most certainly can. If you need something with a higher heat rating and the red color isn't an issue, we also make a Hi Heat Red Silicone that is good to 600 degrees. I have posted that link for you below. Thanks! https://www.amazon.com/Red-Devil-08090I-Resistant-Silicone/dp/B009EC5ELK/ref=sr_1_1?keywords=RED+DEVIL+08090I&qid=1579040983&sr=8-1

Can i use this to seal on the wall around the dryer vent hose is?

Yes, no problem, just be aware the item is not paintable. Thanks!

Is this 100% silicone?

It doesn’t say so on the tube but I believe that it is 100% silicone. I used it to caulk around a new fireplace chimney cap due to the high heat from the fireplace smoke when it’s burning. It should be great since it’s exposed outdoors year round

I will not be using this in automotive environment but rather in a diy project. sealing the edges of a metal box with antifreeze to leak proof work?

Hi, yes, it will then work, I just wanted to make sure it was not being used in a car engine. Thanks!

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Description

🔥 Seal the deal with Red Devil – where extreme temps meet extreme performance!

FLEXIBLE DURABLE - No cracks, no shrinkage, just lasting flexibility.
EASY SOLVENT CLEANUP - Work smart with hassle-free finishing.
VERSATILE APPLICATION - Perfect for HVAC, ducts, vents, windows, gutters & more.
UNMATCHED ADHESION POWER - Bonds metal and building materials like a pro.
EXTREME TEMPERATURE RESILIENCE - Seals that survive from Arctic chills to furnace heat.

Red Devil 089650 Extreme Temperature HVAC/R Silicone Sealant is a premium aluminum-colored silicone paste designed for HVAC and building applications. It withstands temperatures from -60°F to 500°F, offers 500 PSI tensile strength, and provides waterproof, weather-resistant, and long-lasting flexible seals on metal and various surfaces. Ideal for professionals demanding durable, high-performance sealing solutions.

Specifications

Colour	Aluminum
Brand	Red Devil
Liquid Volume	280
Item Form	Paste
Surface Recommendation	Door, Siding, Window
Tensile Strength	500 PSI
Water Resistance Level	Water Resistant
Number of Items	1
Manufacturer	Red Devil
UPC	075339089651
Global Trade Identification Number	00075339089651
Net Quantity	1.0 Count
Material	Silicone
Country of Origin	USA
Model number	089650
Special Feature	Long-lasting Weather-resistant, Excellent Adhesion, Waterproof & Weatherproof, Long-lasting Flexibility
Specific Product Use	Air Conditioners, Ducts, Furnaces, Refrigerators, Vents, Pipes, Window and Door Frames, Skylights, Gutters, Aluminum Siding, Trim
Item Weight	331 g
Product Dimensions	5.08 x 5.08 x 28.58 cm; 331 g
Item model number	089650
Item Height	11.25 Inches
Item Width	2 Inches
Power Source	Hand_powered
Included Components	Extreme Temperature HVAC / R Silicone Sealant
Are batteries included?	No

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