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 CMPD_1pk Damping compound, 1 Tube

Product ID: 293479319

Details

Brand
Green Glue
Item Form
Ounce
Material
Plastic
Special Feature
Soundproofing
Specific Uses For Product
Wall Repair

📏29 oz tube

🔊+9 STC points

🛡️16 sq ft coverage

13884 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔇 Silence is Golden: Elevate Your Space with Green Glue!

ECO FRIENDLY CHOICE - Made with sustainable materials for a greener home.
PROFESSIONAL QUALITY - Trusted by contractors and DIY enthusiasts alike.
SEAMLESS APPLICATION - Easy-to-use nozzle for precise application between layers.
TRANSFORM YOUR SPACE - Elevate your soundproofing game with top-tier damping technology.
ULTIMATE SOUND CONTROL - Achieve a quieter environment with significant STC improvements.

The Green Glue Company CMPD_1pk Damping Compound is a high-performance soundproofing solution, packaged in a convenient 29 oz tube. It covers up to 16 square feet and can enhance your sound insulation by adding 9 STC points when applied between two layers of drywall or plywood.

Specifications

Brand	Green Glue Company
Color	Green
Container Type	Tube
Item Form	Ounce
Item Package Quantity	1
Other Special Features of the Product	Soundproofing Damping Compound
Package Information	Tube
Special Feature	Soundproofing Damping Compound
Volume	29 fluid ounces

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