TMS Acoustical Soundproofing Caulk - Premium Sound Proofing Acoustic Sealant - Superior Noise Reduction, Easy Application, Durable & Long-Lasting, 1 Tube (29oz).

Despite a little expensive it's such a wonderful product, it worked very well for the purpose, reduced the noise at least 50% ...

It works! Dramatically reduced sound

This caulk is pretty good quality. It works way better than I expected its nice and thick. It takes about 24 hours to dry and the smell isn’t bad at all so you don’t have to leave when you’re done which is very helpful.

I'm building a 600 sq ft sound proofed room. I just bought my 5th 6 pack of this item and have been using extensively to seal air leaks. The areas I've done to far are on the seams of plywood sheathing. I've applied on the interior side of the sheathing. There's house wrap on the outside of the sheathing. Long story short, I've just discovered most of the spots I've applied have cracked where the joint is. I can see through the crack as there's no siding on my house yet and the house wrap is translucent. I applied a thick bead and lightly smoothed it over with a spackling knife. But I left at least 1/8' thick. I'm now going to have to reapply with another product. Very frustrating and I'm out $300+ and several days of work.

I really like the way this stuff applies, it's not too thin or too think that it becomes hard to work with. It takes a few days before you can hear the sound proofing difference. I rate it -3 to 5db when completely dry. It also has screw on nozzles so when you go from one container to the next you can just screw on the previous one already filled with the compound (that saves on compound). Just as good as green glue IMO

Easily applied between water resistant Sheetrock and preexisting wall but still have audible noise from beyond application. It minimizes noise but would consider other options for complete silence.

Works well.

Great product