Could this be used to fill a plaster of Paris mold?

Not that I'm aware of, it doesn't really say on the package but it does sit up very fast and is very durable. Sorry but that's the best I can answer your question.

Could this be used to hold an 8x8 supporting a substantial weight?

I had to replace a 4x4 post for my mailbox and used this 2K Post Back Fill. I already had a deep hole in the cement, so this stuff fills up the gaps beautifully all around and keep the post solidly planted. I'm not sure about 8x8, weight is not the issue here but you would need a "solid" hole like in my case to hold to post, then this foam would then fill up any gaps. Good luck.

Can this be used to form the deck list foundation where the 8x8 post then sits on top held by a bracket anchored in the foundation?

No, Fast 2K can only be used for installing posts that are sunk into the ground. It cannot be used as a foundation material nor can any brackets be anchored into it.

Would this be good to use for posts for a horse fence strong and sturdy?

Yes, also sets up quick and should be good for a horse fence.

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🚀 Build smarter, not harder—post anchors redefined!

FAST TRACK INSTALLATION - Set fence or mail posts in just 15 minutes—time is money, save both.
WATERPROOF ROT RESISTANT - Hydrophobic formula protects wood and metal from rot, rust, and decay.
BACK SAVING LIGHTWEIGHT TECH - Ditch the 80-100 lbs concrete—mix in seconds, no mess, no strain.
UNIVERSAL POST COMPATIBILITY - Bonds seamlessly with wood, vinyl, and metal for versatile fencing solutions.
PRO GRADE EXPANDING COMPOSITE - Stronger than concrete, used by utility pros for ultimate post security.

Fast 2K Post Anchor Mix is a lightweight, patent-pending expanding composite footing compound designed to replace heavy concrete for fence and mail post installation. Ready to use in 15 minutes, it offers superior strength, waterproof protection, and rot resistance, making it the professional choice for quick, durable, and mess-free post setting.

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Item Diameter	3.05 Centimeters
Item Form	Foam
Item Weight	2.2 Pounds
UPC	713976908484 669602000322
Number of Items	1
Global Trade Identification Number	00669602000322
Manufacturer	H.B. Fuller
Part Number	254-20-S
Item Weight	2.2 pounds
Item model number	254-20-S
Is Discontinued By Manufacturer	No
Size	1 Pack
Style	Fence Post Mix
Finish	Vinyl, Metal
Item Package Quantity	1
Cutting Diameter	3.05 Centimeters
Measurement System	Metric
Included Components	Multitool Accessory
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty

Fast 2K Post Anchor Mix | Expanding Composite Footing Compound (Fence, 1)

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