Yes, make sure both surfaces are clean. Then cut thin strips of double-stick "exterior" tape. Home Depot carries at least 3 brands - all good - made to hold different weights. Lightest is 5 pounds. I keep a roll in the car and house. Put the strips on inside of plastic connector where exhaust hose should mate. Push exhaust hose inside the plastic connector tight against the strips for at least 10-30 seconds, depending on the brand of double-stick tape. Resist the urge to rough test it. Use painter's tape to generously wrap around the outside of both plastic piece and exhaust hose to hold it in place, turn on your AC. Go enjoy your day. Tomorrow, remove the painter's tape and check the connection. If a problem, post another question. Home Depot will probably send it to me.
I have a few questions for you to think about. Interior or exterior installation/insulation? Sealed or exposed ductwork? I think duct seal is non-toxic (no gases) and chemically neutral (no reaction to other products). That said, in general there is little risk of insulation scraping off the duct seal. Duct seal is similar to Play-Doh only far more dense. Definitely keep away from children and pets. It will block their air passage if swallowed.
No. Painting just makes you feel better and probably shortens its lifespan because paint changes the chemical compound with additives. There are different colored duct seal, you can order online or at pro suppliers - more expensive.
Yes, absolutely. That's where I primarily use it without any problems. It does not evaporate, wear down, wash away, or harden in extreme weather. But I do occasionally inspect for signs of critters. After years, so far, so good.
I would say yes, but I would seal the underside with low expansion spray foam.
It is fine to use around romex etc. I have notice no issues with it.
I haven't tried it on concrete, but it works on steel and rubber - I can't say for sure. If you're penetrating concrete block from the outside to the inside of a building, I'd look for something else or additional, like Bostik. Bostik is a really good seal for keeping water out. But I'm not sure what you're trying to accomplish here, hope this helps some.
I wish I cohld give you a definative answer yes, but, I am an air rifle shooter and I use this in a target box to catch pellets. All I can tell you is it is one sticky substance. Since it only costs $2.98 buy one and test it. I bet it will work
It stays pliable