Plaster represents white with a grey white powder. Gray with the addition of water to the forefront. The cast differs in the degree of grinding: there are plaster fine, medium and coarse grinding. The articles of gypsum of high strength and light weight, but there are drawbacks. The rate of solidification is very high. That is why you need to know exactly how to dissolve the gypsum, because the time to dilute and to add something will remain, the raw material hardens. The plaster is not too much to mix while it hardens faster. Mix the plaster in small portions, and the master only a few minutes in order to knead the composition and to apply it in the case.
Used for any of the works of mark plaster requires special cultivation, in which the powder is added water, and the powder poured in the water. Capacity for cultivation of plaster must be such that with success and then to scrape it from the walls. Good fit, plastic and metal crockery. The proportions of breeding usually make up one part water to two parts powder. Powder poured in the water slowly spreading over the entire area and slowly stir until then, until the water is completely impregnated with the powder. Then 2-3 minutes the solution should stand and thicken without stirring. A sign that the plaster you use - the solution has thickened slightly and is heated. After the powder is soaked with water and started to thicken, add the components in a solution is impossible. Such a solution will be ruined, as the astringent characteristics it will be low.
High speed curing - lack of a mixture of plaster, was invented a few ways of dealing with it. First and foremost is the trade gipsokleevoj mastic. The proportions are - in a bucket of water add 15 g joiner's glue. You can take the PVA glue. To prepare water glue mix thoroughly, and only then poured the plaster. Finally set the mixture begins approximately 20 minutes after its preparation, which is sufficient for different kinds of preparations and bug fixes. In this embodiment, the cooking is valid the same rule is not to add any components later. If the proportion of the solution obtained absolutely will not fit, it is better to throw it away and start again.
In order to slow down the hardening, add citric or tartaric acid. The proportions for the lemon - 0,1-0,2% by weight of gypsum. Acid is first mixed with water, then add gypsum. In those cases, if necessary, however, to reduce the setting time of gypsum in water to prepare a solution is added, stirring thoroughly, salt.