paint- Paints are surface coatings, generally suitable for site use and marketed in liquid form. The may be used for one or more of the following purposes.-To protect the underlying surface by exclusion of atmosphere, moisture, fungi and insects.1 To provide a decorative easily maintained surface.2 To provide light and heat reflecting properties.3 To give special effects; e.g. inhibitive paint for protection of metals, electically conductive paints as a source of heat, condensation resisting paints, etc. Painting systesm – There are three stages in a painting system – primer, undercoat and finishing coat. Primingcoat and undercoat do not provide an impermeable dirt-resistant coating Primer – The fubction of the primer is to grip the substrate, to provide protection against corrossion / dampness and to provide a good key for remaining coats. Undercoat – The function of the undercoat is to provide good opacity (hiding power) together with a smooth surface which provides a good key for fininshing coat. Undercoats usualyy contain large quantities of pigments to provide opacity. Finishing coat – This provides a durable layer of the required colour and texture. Traditionally, most finishing coats were gloss and it tend to have the resistance to dirt since they provide very smooth surface. However, some paint types such as emulsion will not normally give the high gloss of traditional oil paint

Special paints.Oils paint- Oilssuch as teak oil are used mainly for internal applications exterior use are high in solids producing an ultraviolet resistant, micro-porous finish which may be transparent or opaque. The finish, which should not flake or crack, may be renovated by the application of a further coat3 water profinpaint-Waterproof paints and coatings can be applied by either a actor or homeowner. When applied correctly, it coats the walls with will quickly blister and flake off the basement walls, creating a mess. ... Waterproof paint is an easy-to-use, inexpensive product that a barrierthat's meant to hold back waterand moisture4Emulsion paint-is themostcommonly used paint for interior walls and ceilings and there are three main types of finishes you need to know about. Vinyl matt adhesion These paints have the advantage of being water-miscible. On drying out, coalescence of polymer particles occurs, resulting in a coherent film with moderate resistance to water.Bituminous Paints - are made of asphalt bitumen dissolved in mineral spirit or naphtha. They are black in colour, Enamel Paints - Enamel paintsbased on polyurethane or alkyd resins give highly durable impact-resistant easily cleaned hard gloss surfaces. Colours tend to be strong and bright, suitable for machinery and plant in interior and exterior locations wall or ceiling.Heat Resisting Paint - Aluminium paint, which has a glossy metallic finish, is resistant microns is typical. Acrylated to temperatures up to 230contr- 260°C. A dry-film thickness of 15 rubber paints can usually be used satisfactorily to100°C.5Propertis  of good paint-1•Wearability:2 Paint must be resistant to the wear and tear of the atmosphere and should maintain its color, smoothness and fi nish for a long •Covering ability: ... time. ... •Environmentally Friendly: ..5 Aesthetic: •Practical and cost effective. Painting SpecificMaterials -1Ferrous metals like iron and steel can oxidize to form rust. This weakens the metal and can cause failure of the part. To avoid rust and corrosion, a variety of different coatings can be applied to the metal. Coatings are designed to prevent oxidation by keeping the paint. Non-Ferrous Metals – Zinc and aluminium are the non-ferrous metals most likely to require surface coatings and each provides a poor key for paint, unless surface trearment is first carried out. Zinc reacts with most oilbased paints, COMMON DEFECTS AND REMEDIES IN PAINTING. An Architect Explains. Blistering: Blistering or Swelling of paint is caused due to the trapping of air, moisture or solvent between the surface and the paint film. The Solution– Remove any unstable paint films and allow the wall to dry thoroughly ing soluble salts which reduce CONSTITUENTS OF PAINTS: 1. Pigments Pigments are various inorganic or organic insoluble substances which are widely used in surface coatings. The most important properties of pigments are opacity, good covering power, mixing ability with oil, chemical inertness, non toxicity or low toxicity, high hiding power, high tinting strength and reasonable cost

Lime- is a calcium-containing inorganic mineral composed primarily of oxides, and hydroxide, usually calcium oxide and/ or calcium hydroxide. It is also the name for calcium oxide which occurs as a product of coal seam fires and in altered limestone xenoliths in volcanic ejecta. The word lime originates with its earliest use as building mortar and has the sense of sticking or adhering. These materials are still used in large quantities as building and engineering materials

Manufacture of Lime- The manufacturing of the lime is done by following the process of collection of the lime stones, calcination of the limestone, and then slaking of the limestone. Lime is of the three types. It is fat lime, hydraulic lime and the poor lime. If we have to prepare the fat lime then the quality of the limestone should be such that it contains about 90 to 95% of the limestone and should contain less than 5% of the impurities.Calcium carbonate (limestone) is turned into calcium oxide (quick lime) by heating. This dissolves to form calcium hydroxide (slaked lime) which can be used to test for carbon dioxide if it is dissolved in water to make limewater. When testing for carbon dioxide, you produce calcium carbonate which causes the milky colour and completing the cycle.