Red Devil 0896 Extreme Temperature HVAC/R Silicone Sealant, 280 ml, White, 12 Pack, Made in USA

If you're looking to stop HVAC system you can't go wrong here. Good adhesion and flexible joint sealer.

I cut the nozzle, put it on the caulking gun, squeezed the trigger and material just oozed out the back. I ended up using my fingers with gloves to scoop up the silicone from the bottom of the tube and put it on my fireplace instead. Will know more once it's fully cured tomorrow.I just wish that the product will work as intended with the gun instead of fingers. Maybe Red Devil will send me another tube with better construction

works great good sealant

I'll be buying this again for sure.

sealed up some duct work that was close to the furnace. I dd not want ugly metal tape so used this. stuff stinks to high hell so use in well vented area. seals up good and holds up to heat.

To messy,hard to get out

Went on as should,as I use to caulk around air leaks in ductwork

I bought this as a last resort when trying to seal a dishwasher installation. Now I use it for a lot of things for which I previously would have used silicone caulk. Installing glass in a bookcase frame. Sealing plywood panel in an exterior door. I will use it instead of caulk in many applications.

Burning only oak, which has an extremely high temperature, one of our glass panels shattered on the fireplace. we replaced and used this silicon to install. It's held fast and given no problems for the two years since.

I used this for sealing the joints on new flue vent assemblies and elbows for a high efficiency commercial boiler and it has performed as well as anticipated. It has gone through the heating season and appears to be holding up well with no leaks or signs of peeling or erosion. This sealant is not recommended for applications where the temperature is higher than 400 deg. F, such as flues for wood stoves or older type furnaces where a lot of heat was wasted up the flue. I also used some to form a section to replace some broken oven door gasket and it worked out. I intend to also use use it for HVAC vents and ducts.

looks like a quality product. But functionality remains to be seen

This is a great product....had some small jobs to do and worked perfect for them and was easy to use. Easy clean up as well.

Installed a Stainless steel chimney cap on a fireplace chimney, with it's heat resistance and aluminum color it was the perfect silicone for the job. So far so good, product is doing exactly what was needed.