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The tools used to plaster walls. Plasterwork is construction or ornamentation done with plaster, such as a layer of plaster on an interior or exterior wall structure, or plaster decorative moldings on ceilings or walls.
Plaster can be relatively easily worked with metal tools and sandpaper and can be moulded, either on site or in advance, and worked pieces can be put in place with adhesive. Plaster is suitable for finishing rather than load-bearing, and when thickly applied for decoration may require a hidden supporting framework.
Air-drying is the simplest method but must be conducted carefully and monitored well, as bone, horn, antler, and ivory objects are each susceptible to fluctuations in temperature and humidity and liable to crack. [3] Air drying is the simplest method, and should be slow and controlled as the risks include swelling, cracking, and delamination.
A plasterer is a tradesman who works with plaster, such as forming a layer of plaster on an interior wall or plaster decorative moldings on ceilings or walls. The process of creating plasterwork, called plastering, has been used in building construction for centuries. A plasterer is someone who does a full 4 or 2 years apprenticeship to be ...
For example, cracks can form in a gesso ground due to the embrittlement and movement of its support, then become visible in the paint film. [22] Tempera can develop cracks over time that are visible to the naked eye, and flaking caused by air bubbles. Tempera paintings are thought to be more resistant to materials typically used during cleanings.
The plaster is not pure plaster of Paris, but rather has additives to improve green strength, dry strength, permeability, and castability.For instance, talc or magnesium oxide are added to prevent cracking and reduce setting time; lime and cement limit expansion during baking; glass fibers increase strength; sand can be used as a filler. [1]
Typical French craquelure in a portrait from c. 1750, larger and less regular patterns, with curving cracks. Painting systems are composed of complex layers with unique mechanical properties that depend on the type of drying oil or paint medium used and the presence of paint additives, such as organic solvents, surfactants, and plasticizers.
Fine tuning the repair often involves tapping down the repair to remove small high spots. Technicians can blend in high ridges and relieve pressure using light hammers with non-marring hammer heads. Cracking or chipping can be avoided with the use of heat, although a re-painted surface has a greater likelihood of cracking.
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