Neoprene (duct seal)

[PoorOwner]

Has anyone used this stuff?
Wanted to seal the hole the lineset is coming thru.

Does it set hard or go bad since it looks to be in a well sealed bag.

Can I put a little silicone on the seams to get it to seal tighter?

 

[rlitman]

It's a non-drying putty. Just press it in, and it will stay put.

 

[PoorOwner]

It worked well it was just like plumbers putty

I used silicone to fill the smaller crack and thinly coated the putty a bit. From what I have seen they crack after many years.

 

[Ohmthis]

I always stuff fiberglass insulation in the void and then seal with dynaflex 230 caulking. The caulking is flexible and if you need to get back into the void much easier than with expandable foam.