He is using plaster as if for for the first time.
In 1830 a more substantial house was built using lath and plaster.
It's best to use casting plaster for this.
If you are remodeling, use gypsum board, plaster, or real wood for walls.
On the interior, the walls are covered using plaster and lath.
If one piece is not thick enough, build up the necessary thickness with two layers, or by using plaster behind the gypsum board.
The indoor resemble a cave that was uniquely designed using plaster of paris.
To repair holes up to about six inches across, use plaster of Paris.
To use plaster of Paris, clean and thoroughly wet the damaged area.
All three have been using plaster for more than 30 years.