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.

ASIN	B00LAFUC34
Best Sellers Rank	#286,944 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #578 in Livestock Fencing
Brand	H.B. Fuller
Brand Name	H.B. Fuller
Country of Origin	USA
Customer Reviews	4.3 out of 5 stars 1,622 Reviews
Global Trade Identification Number	00669602000322
Item Dimensions	38 x 216 x 191 Millimeters
Item Weight	2.5 Pounds
Item dimensions L x W x H	38 x 216 x 191 Millimeters
Manufacturer	ROYAL ADHESIVES & SEALANTS CANADA
UPC	713976908484 669602000322

Fast 2k Fence Post Backfill - 26 fl oz

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