Will this work well if applied directly to the studs then 1 layer of drywall? Would this be more effective than 1/8" soundproofing tape?

The way to do that would be to decouple the drywall and the studs with resilient clips or channels. https://www.amazon.com/Green-Glue-Noiseproofing-Whisper-Clips/dp/B00HU5E1XA/ref=sr_1_10?camp=1789&creative=9325&keywords=%22resilient+sound+isolation+clip%22+1&linkCode=ur2&qid=1565794639&s=gateway&sr=8-10

can you use this on the back of an outdoor fence to muffle roadnoise?

This is not really meant for outdoor use.

Willl this work with an existing single wall construction house as an additional layer to reduce sound transmission?

I used it in conjuction with a second layer of drywall. It needs the second layer to spread the liquid over the surface of the first layer. Look it up on YouTube. There are a few instructional videos that explain the use rather well.

I'm adding a layer of drywall to a plaster wall. Do I need to paint primer on the plaster wall first?

No reason to in regards to the Green Glue with drywall. You do want to make sure the wall is smooth though, by sanding it down if necessary.

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Company 10730 Noiseproofing Compound, 12 Pack

Company 10730 Noiseproofing Compound, 12 Pack

Product ID: 346490921

Details

Brand
Green Glue
Item form
Paste
Material
Wood
Special features
Up to 90%
Specific uses for product
Construction

📉Proven STC rating of 56

🔇Up to 90% noise reduction

🛠️12 tubes per case for bulk projects

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€ 984.40

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Sold byAmazon FranceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔇 Silence is the new luxury—lock in your peace with Green Glue!

BULK POWERHOUSE - 12 tubes (29oz each) ready to tackle large-scale soundproofing projects with ease.
DUAL NOISE DEFENSE - Effectively reduces both airborne and impact noise—perfect for multi-family homes and offices.
LOW FREQUENCY MASTERY - Specially engineered to crush low-frequency noise that other products miss.
INDUSTRY PROVEN SILENCE - Backed by independent lab tests showing a stellar STC rating of 56 for superior sound isolation.
PLUG PLAY INSTALLATION - Comes with clear bilingual instructions and applies easily with a standard caulk gun for hassle-free setup.

Green Glue Noiseproofing Compound is a professional-grade sound dampening paste sold in convenient 12-pack tubes, delivering up to 90% noise reduction. Independently tested to achieve an STC rating of 56, it excels at blocking both airborne and impact noise, especially low-frequency sounds. Ideal for walls, floors, and ceilings, it’s water-resistant and easy to apply with standard tools, making it the go-to solution for modern soundproofing projects in homes, offices, and studios.

Specifications

Asin	B000SKWD8Y
Best Sellers Rank	#730 in Cyanoacrylate Adhesives
Date First Available	15 September 2023
Is Discontinued By Manufacturer	No
Item Model Number	10730
Manufacturer	Green Glue Company
Product Dimensions	30.48 x 20.32 x 38.1 cm; 11.79 kg

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