RectorSeal Duct Seal 81880 Duct Seal Compound, Easily Applied to HVAC/R, Plumbing, & Metal Fabrication, Paintable & Superior General Purpose Sealant, Easy Application, HVAC, 1 lb

Wow, wish I had known about this product before! I purchased it after searching for a way to seal a draft coming in around an interior water pipe. The stickiness was very good yet it was easy to work with, and it took care of sealing out the cold air coming in around the pipe, I highly recommend this.

I installed a whole house humidifier (it's dry here in Colorado in the winter) on my furnace and wanted to seal the outside and a certain AI assistant recommended this stuff. It was a good call, I rolled it with my hands into cylinders and put it around the humidifier and the seal is solid and seems like it will last a long time. I am very pleased. It's sticky but not super sticky, pliable but seems like it will stay in place. It doesn't smell much (if at all) and I washed my hands with soap and water and most of it came off with minimal effort.

Works as intended and no surprises. I used it on my furnace housing inside my basement so I can’t speak to outdoor exposure.

I extended my GFCI receptacle out away from the vinyl siding leaving some cracks on the unlevel surface. Duck seal to the rescue! I sealed around the box and made a seal for the so-called waterproof cover box. I didn't give it a 5 yet, let's see how it holds up. I've had to replace GFCI receptacles too frequently so hopefully this will keep water and moisture out that destroys the GFCI.

Sticks well to brick walls without any prior preparations. Very easy to work with!

Easy to use. Rolled out section and wrapped around AC pipe and water spigots to fill small gaps. So far, so good.

After recently residing my house, I needed a block of this material to seal the gas line's service entrance. Although the gap was small enough to seal with a bead of caulk, this stuff is easier and less messy to apply with the same result. Product Quality: It's tough to determine this type of material's quality visually although I've used this material and brand before and it's an excellent, moldable, non-hardening sealant. Product Use: Fresh from the delivery truck in 30 degree weather, the block was stiff, but still moldable. It became increasingly malleable with the rise in indoors temperature, reaching clay-like moldability. Although this material is sticky, it leaves no sticky residue on either hands or applied surfaces. Final Thoughts: If you need to seal the wire or pipe poking through your wall to the great outdoors, this is the stuff to use. It's less messy than caulk, arguably longer lasting, and there's considerably less waste material. Since it's non-hardening, it should last if stored properly. And it's a third of the cost on Amazon as at the big box store! I bought second block "just in case."

Workable once kneaded by hand to form the required shape, weather resistant to provide protection of any opening relative to a pipe opening or a slim joint, will adhere to the surface to achieve stability