Came across a fantastic plasterer from the St Albans area his name is Jason Moffat. How he came to my attention was he had a excellent youtube video that introduced him and told me what kind of aspects he covers in plastering, I typed plasterers St Albans.
Gypsum is a construction material for the protective layer and / or decorative walls and ceilings and is cast for molding and decorative elements.  In English, "patches" usually means a material for the interior decoration of buildings used as "rendering" to external applications refers frequently.  Another imprecise term for the material is stucco, which is also often used for stucco, is a way of making relief decoration, rather than flat surfaces. The most common types of gypsum contain either mainly gypsum, lime or cement, , but all operate similarly. The plaster is prepared and mixed with water to form a thick paste, but used immediately before is applied to the surface in the form of a dry powder. The reaction with water forming heat cures due to crystallization and hydrated gypsum. Gypsum can be relatively easy to work with metal tools or even sandpaper and can be molded on site or in advance make preformed sections which are brought in place with adhesive. Gypsum is not a solid material; It is suitable for the equipment instead cradle charging and when it is applied in a thick layer for decorating, require a hidden frame support, generally made of metal.