Plastering a swimming pool - GIF

Plastering a swimming pool.

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Previously:

Automatic wall plastering machine - GIF
Plastering faux stone wall - GIF
Plastering walls efficiently - GIF
Wall plastering machine
Cleaning a dirty swimming pool - GIF
Finishing a swimming pool - GIF

Does anyone know what the working time is of this plaster? It looks very long in the video.

And they can all do it in heels!