It is know to be concrete, gunite or shotcrete.
You drain the water then plaster the walls from inside
No, salt does not damage the plaster. Improper water balance will.
No Plaster of Paris is too soft and too porous to be useful in any thing to do with a swimming pool.
no
paper and plaster
Plaster
Frescos are painted directly onto damp plaster on walls.
Yes, plaster will dry out and crack.
Yes, plaster is heavy relative to its volume. It is a dense material often used for construction and art due to its strength and durability.
No, it is not recommended to plaster directly onto the brown side of plasterboard. The brown side is usually the paper facing, which is not a suitable surface for plaster application. It is best to apply plaster onto the white side of the plasterboard or use a suitable primer before plastering.
Before the invention of dry wall (some call it plaster board or gypsum board), walls and ceilings were slathered with plaster of Paris over lathe board (small, thin slats of wood that were nailed to the studs). This was smoothed out or in the case of some ceilings, sculpted into decorative shapes. Sometimes, crown molding was even sculpted directly on the walls with plaster. So, a plastered cieling is just that--a ceiling that has been plastered. It is a work intensive craft, and requires a high degree of skill and training to do.
They will wear gloves and sometimes a plaster underneath them to stop infection spreading