Truly, Plaster of Paris is a wonder material. Let's see what exactly it is -
Plaster is a building material used for the
protective and/or decorative coating of walls and ceilings and for moulding and
casting decorative elements. In English "plaster" usually means a
material used for the interiors of buildings, while "render" commonly
refers to external applications. Another imprecise term used for the material
is stucco,
which is also often used for plaster work that is worked in some way
to produce relief decoration,
rather than flat surfaces.
The most common types of plaster mainly
contain either gypsum, lime, or cement, but all work in a
similar way. The plaster is manufactured as a dry powder and is mixed with
water to form a stiff but workable paste immediately before it is applied to
the surface. The reaction with water liberates heat
through crystallization and the hydrated plaster then hardens.
Plaster can be relatively easily worked with
metal tools or even sandpaper, and can be moulded, either on site or to
make pre-formed sections in advance, which are put in place with adhesive.
Plaster is not a strong material; it is suitable for finishing, rather than
load-bearing, and when thickly applied for decoration may require a hidden
supporting framework, usually in metal.
Gypsum
plaster, or plaster of Paris, is produced by heating gypsum to
about 300 °F (150 °C).
CaSO4·2H2O + heat → CaSO4·0.5H2O + 1.5H2O
Procedure -
- Mix Plaster Powder with water until you get a thick liquid consistency.
- Take a square shaped cloth (Of any material, my favorite choice is jute rag as it gives fantastic texture)
- Dip the cloth in plaster and completely soak it with the mixture.
- Take a tumbler/bottle and cover it with a plastic sheet.
- Invert it and put the cloth on it as shown -
6. Let it dry for 24 hrs
7. Remove the hardened vase and paint it with Acrylic/Enamel paints.