Casting of products . The Plaster mould first of all is necessary for clearing a soft brush and to grease with stearin greasing or technical vaseline. Then fill in a plaster solution: in the beginning a thin layer, in regular intervals distributing it on a form surface and after that the form fill in to top, surpluses remove rejkoj. In need of pouring process in a solution put armature. If fill in the form poslojno, a surface of the previous layer before pouring notch for the best coupling of layers. For the purpose of simplification of products in certain cases pouring is done not on all depth of the form, and only for the thickness by of 20-30 mm on all plane, reinforcing thus products a thin copper or aluminium wire. It is necessary to do the back party of a product rough, for this purpose on it a knife make grooves depth of 3-4 mm.
When the plaster solution will harden, the form overturn casting downwards and cautiously tap a wooden hammer. After removal of the form and drying the product if it does not demand corrections, is ready to use.
The Glutinous form also before the work beginning clear and grease. Pouring is carried out in the same sequence. Casting process in formoplastovyh forms is similar to casting process in glutinous forms, with that difference that before casting it is recommended to moisten the form with water.
In certain cases products from plaster require additional completion: formed on an equal surface bugorki delete a chisel and tsiklej, a rough surface grind a small emery paper, bowls close up a plaster solution, etc.
Colouring of products . For the purpose of increase of decorative effect of products it is possible to do them of plaster colour or to paint, simulating bronze, pig-iron, a tree, etc. Materials.
Bronze Imitation make thus. In the beginning a product paint the oil paint chosen to match of bronze both diluted sikkativom and turpentine (in equal parts). At colour selection it is recommended to use such paints, as ohra golden, strontsianovaja yellow and umbra. When the paint will dry up, a product surface cover with a thin layer of the wax dissolved in turpentine on which a brush moistened in wax, put bronze powder. After prosyhanija a covering wipe a rag for giving to it of metal shine.
a Fig. 60. Fastening of the ceiling socket :
And - a stopper under a screw; 6 - a screw; in - a plaster solution; g - overlapping; d - the socket
For pig-iron imitation use graphite. A product surface in the beginning cover with the oil paint chosen to match of pig-iron and diluted with drying oil with addition sikkativa. After drying a product wipe graphite with small amount addition ohry, whitewash, an ultramarine and mummies.
At imitation of wood it is necessary to paint a product (the section " Painting Ёрсю=№" see;). Before its painting impregnate with drying oil or immerse in the kindled paraffin. In the same way it is possible to paint a plaster marbled product, a terracotta, etc.
Installation and fastening of products. Decorative products from plaster to a surface of walls and ceilings krepjat by means of a plaster solution. In cases when it is required to fix products of the big sizes, in addition use ankernoe fastening.
The Sequence of works at facing of walls by plaster tiles of the small sizes (to 200X200 mm) differs nothing from facing ceramic glazurovannymi tiles. However in technology of works there are differences. Between tiles, as a rule, do not leave seams as casting of products from one form causes a split-hair accuracy of overall dimensions of tiles. At tile installation on its moistened back surface with notches impose a liquid plaster solution and a hand press to the planned place. If there are cracks in joints, they are closed up also plaster and smooth out an emery paper. For delay of terms shvatyvanija a plaster solution into it enter glues - mezdrovyj, PVA and others in quantity to 1 % the got mixed up volume. It is necessary to remember that it is not necessary to plant seized solution with water and to use for work as it will not have any more necessary properties.
It is impossible to use hot water for solution soaking as it increases its speed shvatyvanija.
Installation and strengthening pogonazhnyh plaster products of small width (to 10 sm) begin from corners of walls with adjustment dry separate pieces. Then details establish on a solution. Joints between them close up a solution and smooth out.
In the course of work it is necessary to check vertical position and horizontal position of packing pogonazhnyh products a cord, rejkoj, level, a plumb.
Large elements of a moulding in addition fix nails or screws. For this purpose in a product installation site on a wall arrange wooden stoppers into which then nails will be hammered or to be screwed up screws through the apertures in advance drilled in plaster details. That hats of nails and screws were not visible, they should be drowned on depth of 3-4 mm, then are covered by a nitrovarnish and closed up by a solution.
Ceiling sockets is better to establish on a solution with application of additional fastening by nails. For this purpose define an exact place of placing of the socket, put it to a ceiling and mark a contour a pencil. Then the back party of the socket and an installation site notch. After that on a circle of the socket and in the middle of it equally spaced bore through apertures under nails or screws at an angle 60° to a ceiling surface (usually do 4-6 apertures). The socket prepared thus put to a ceiling and a nail or a pencil mark on an installation site ceiling djubelej or stoppers. Apertures in a ceiling also are bored through at an angle 60°. After that on the back party of the socket impose a liquid solution, press it to an installation site so that apertures in the socket coincided with stoppers or djubeljami. Then screw up screws so that hats have been drowned on 3-4 mm, varnish and cover with a plaster solution. Seams between a ceiling and the socket also are necessary for closing up a solution and to smooth out (fig. 60).