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RectorSeal HI-TEMP 100-Percent RTV Silicone Caulk is a one component caulk which cures to a strong durable resilient rubber. It will adhere to glass, clean metal, most types of non-oily woods, vulcanized silicone rubber, silicone resins, natural and synthetic fibers, ceramic, paper, as well as many painted and plastic surfaces.
From the Manufacturer
RectorSeal HI-TEMP 100-Percent RTV Silicone Caulk is a one component caulk which cures to a strong durable resilient rubber. It will adhere to glass, clean metal, most types of non-oily woods, vulcanized silicone rubber, silicone resins, natural and synthetic fibers, ceramic, paper, as well as many painted and plastic surfaces.
Dillon
Reviewed in the United States on April 4, 2025
Seems like it does what it was intended however I wouldn't use it indoors if what you're using it on is going to get very hot, like on my wood stove I used it around the chimney because I was having draft problems, now when I make a fire it stinks a little bit, but I don't think it's really intended for that purpose anyway. Turns out I just needed to add more chimney.
Daisy
Reviewed in the United States on February 14, 2024
High temp silicone works great on Chinese diesel heater exhaust Coupling.
Simple788469
Reviewed in the United States on January 10, 2023
Works as intended. Used to secure chimney cap on flue for wood burning fireplace.
JBR_
Reviewed in the United States on October 22, 2022
I used this to seal exhaust pipes on a wood stove. So far it's working well after several days of use. I also used this to seal the doors as the fiber cloth seal was in bad shape , and it seems to be hold up good as long as it's not exposed to direct flame.(note: I used plastic wrap between the door and stove to stop the silicone from glueing the door on while it dried.)
Chris H
Reviewed in the United States on July 30, 2020
I ordered this caulk to seal an approximate 3/8" to 1/2" gap between my chimney concrete cap and clay flue liners. Caulk worked excellent to fill the gap. Caulk is thick. I used a putty knife to shape as needed. Happy with the result and would order again if needed. I used one tube per clay flue liner due to the large gap I needed to fill.
PB
Reviewed in Canada on July 24, 2020
I had red roof steel, and needed to seal a large area but didn't want it to show. AND I wanted it to dry quick, stay flexible, etc. It really did. Excellent in every way
cmathis
Reviewed in the United States on March 8, 2020
Good for the job. Really thick I got 2 tubes just needed one. Thicker than regular silicone. Good stuff maner.
Pascal Rollin
Reviewed in Canada on April 30, 2020
I use it as gasket maker
Customer
Reviewed in the United States on April 3, 2017
used it on 20w halogen garden path night lighting to repair the worn out over time fixtures, and months later it is holding up great, no complaints so far...
ALECAT
Reviewed in the United States on February 27, 2015
This helped do what most say could not be done,i.e., patch a hole in a steam boiler. I used this in conjunction with scrap cast iron. It held up pretty well until I could replace the unit.
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