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Buon frescoes are difficult to create because of the deadline associated with the drying plaster. Generally, a layer of plaster will require ten to twelve hours to dry; ideally, an artist would begin to paint after one hour and continue until two hours before the drying time—giving seven to nine hours' working time.
The buon fresco technique consists of painting with pigment ground in water on a thin layer of wet, fresh, lime mortar or plaster, for which the Italian word is intonaco. Because of the chemical makeup of the plaster, a binder is not required. But, some artists used lime as a binding medium for pigment to slow the drying process of the plaster ...
Cure time: There is only a 24-hour wait time to decorate over "one coat" veneer. Cure time is only for two or three coat plastering that may have lime in the finish. It is recommended to wait 28 days before painting a lime finish wall. However this wait time can be shortened by using an oil based primer once the plaster is dry. [6]
The plaster contains liquid lime (calcium hydroxide). In the process of drying, the liquid lime in the plaster combines with the paints and turns into carbonate of lime, which is chemically equivalent to limestone or marble. Upon drying and setting, the pigments permanently fuse to the plaster to form a solid, durable painting. [5]
The oldest method, known as the a massello technique, involves cutting the wall and removing a considerable part of it together with both layers of plaster and the fresco painting itself. The stacco technique, on the other hand, involves removing only the preparatory layer of plaster, called the arriccio together with the painted surface.
Spent a day framing (goodwill buys if poor quality i'd paint/sand/etc), and put photos up around house, while simultaneously filling any divits/cracks/etc. in old plaster and touching up paint.
Lime plaster was a common building material for wall surfaces in a process known as lath and plaster, whereby a series of wooden strips on a studwork frame was covered with a semi-dry plaster that hardened into a surface. The plaster used in most lath and plaster construction was mainly lime plaster, with a cure time of about a month. To ...
The plaster is painted while still wet, in order to allow the pigment to penetrate into the intonaco itself. An earlier layer, called arriccio , is laid slightly coarsely to provide a key for the intonaco, and must be allowed to dry, usually for some days, before the final very thin layer is applied and painted on. [ 1 ]