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elfman t1_iyc0bti wrote

If you go this route, don't use pre-mix plaster.

It'll shrink like crazy! :)

Go for the 30-90 minute powder you have to mix. Watch some YouTube videos. :)

Edit: Powder you have to mix yourself. Pre-mixed dries out and shrinks. Freshly mixed 'mud' will cure and retain it's shape. It's also a lot more durable when cured. (But. you're still gonna need more than that to cover this depth. :)

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