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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Weatherables Fast 2k フェンスポストバックフィル。

Product ID: 759382318

Details

ブランド
H.B. Fuller
商品パッケージ数
1
材質
接着剤、シーラント
特徴
軽量
色
無色(No Color)

⚡Sets fence posts in 15 minutes

💧Waterproof & hydrophobic to prevent rot & rust

🪶Replaces 80-100 lbs concrete with lightweight 2.2 lbs bag

NT$5159

Duties & taxes included

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Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Fast, strong, and featherlight—reinvent your fence game today!

LIGHTWEIGHT POWER - Replace bulky concrete bags with a compact 2.2 lb bag that expands to fill the hole perfectly.
UNIVERSAL APPLICATION - Perfect for fences, mailboxes, sports posts, garden lights, and more—join thousands of savvy DIY pros.
EFFORTLESS INSTALLATION - Say goodbye to heavy lifting—set posts in just 15 minutes with no mixing or mess.
WEATHERPROOF PROTECTION - Hydrophobic formula shields posts from water damage, rust, and rot—even in winter conditions.
PROFESSIONAL GRADE STRENGTH - Uses advanced composite tech trusted by pros for superior durability and adhesion to wood, vinyl, and metal.

Weatherables Fast 2K Fence Post Backfill is a revolutionary 26 oz lightweight bag that replaces traditional 80-100 lb concrete. It sets fence posts in just 15 minutes without water or mixing, using professional-grade extended composite technology. Waterproof and hydrophobic, it protects posts from rot and rust, making it ideal for wood, vinyl, and metal posts in all weather conditions.

Specifications

ASIN	B00LAFUC34
Compatible Material	木材
GTIN (Global Trade Identification Number)	00669602000322
UPC	713976908484 669602000322
おすすめ度	4.3 5つ星のうち4.3 (1,667) var
カラー	無色(No Color)
パッケージ内に含まれる商品の数	1
パッケージ商品数	1
ブランド名	H.B. Fuller
メーカー名	H.B. Fuller
メーカー型番	254-20-S
モデル番号	250
ユニット数	1 個
体積	32.8 液量オンス
含まれるコンポーネント	マルチツールアクセサリー。
商品の重量	2.2 ポンド
商品種別	高速 2K 26オンスバックフィル
特殊機能	軽量
素材	接着剤、シーラント

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NT$5159

Duties & taxes included

In stock

Sold byAmazon TaiwanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Taiwan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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