RectorSeal Duct Seal 81880 Compound, Easily Applied to Plumbing & Metal Fabrication, Paintable General Purpose Sealant, 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.

Worked well and easy to use. It was just what was needed to repair cracking cement around the exterior hvac condensation vent pipe. Great value.

Worked as expected.

Great product. Worked as expected to seal hole around electrical service cable.

This stuff is pretty soft and easy to install. It's about the same price as the big box stores for the same amount but I didnt have to leave the house and drive all the way to pick it up. So in that sense it saved me a bit of money.

Product is as described. Its a lump of dark grey duct seal. Works like playdoh. I used it to "plug" the area around a hot water inlet on my HVAC that was "whistling" due to a poor seal.

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."