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PAINTS

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Characteristics of ideal paint
constituent of oil paint
Types of paint
Painting brush
Priming,Stopping,Spray painting
Painting in
wood
iron and steel surfaces
plastered surfaces
Defects in paints

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PAINTS

  1. 1. CONTENTS  Objects  Characteristics of idael paint  constituent of oil paint  Types of paint  Painting brush  Priming,Stopping,Spray painting  Painting in  wood  iron and steel surfaces  plastered surfaces  Defects in paints
  2. 2. OBJECTS  Paint perform the following function:  1. It protects wood from decaying effect.  2. It prevents corrosion in metals.  3. It protects the surface from harmful effects of atmospheric agencies.  4. It gives decorative and attractive appearance to the surfaces.  5. It renders surfaces hygienically safe and clean.
  3. 3. CHARACTERISTICS OF AN IDEAL PAINT  1. The paint should be cheap.  2. It should be easy and harmless to the user.  3. The painted surface should dry neither too slowly nor two rapidly.  4. It should retain its original colour for a long time.  5. When applied the paint should from a thin uniform film on the painted surface.
  4. 4. CONSTITUENTS OF AN OIL PAINT  An oil paint essentially consists of the following constituents:  1. A base.  2. An inert extender or filler.  3. A vehicle or carrier.  4. A drier.  5. A thinner.  6. A colouring pigment.
  5. 5. TYPES OF PAINTS  1. Aluminium paint.  2. Anti corrosive paints.  3. Asbestos paint.  4. Bituminous paint.  5. Bronze paint.  6. Cellulose paint.  7. Casein paint.  8. Cement paint  9. Graphic paint.  10. Plastic paint.  11. Silicate paint.  12. Luminous paint.  13. Rubber paint.
  6. 6. PAINTING BRUSH  Good brushes should only be used for painting work. Old brushes do not apply paint uniformly on the surface. The brushes having good bristle only should be used. Bristle brushes are elastic and have good paint holding capacity.
  7. 7. PRIMING  This is actually first coat of the paint whose main function is to fill the pores of wooden surface by penetrating into the surface. It also acts as the foundation for subsequent coats of the paint. The priming coat is generally applied before fixing wood work.
  8. 8. STOPPING  The process consist of filling up all nails holes, cracks , open joints, dents and other depression on the surface by putty. Putty is prepared by kneeding white chalk powder. Putty should be given same colour.
  9. 9. SPRAY PAINTING  It is modern method of applying paint on the surface. For this spray gun or pistol is used. The pistol works under compressed air and throws a spray of paint.
  10. 10. PAINTING THE SURFACE OF NEW WOOD WORK  1.Wood work should be properly seasoned  2.After having cleaned, the surface is knotted  3.Now apply priming coat  4.When priming coat becomes dry,the surface is stopped  5.Under coatings are applied  6.Finishing coat is applied
  11. 11. PAINTING IRON & STEEL SURFACES  Surface is rubbed with wire brushes to remove rust  Sufrace should be washed with caustic soda or lime water to remove grease spot.  A priming coat of iron oxide paint of red lead paint should be applied on cleaned surface.  Now, two or more coats of paints applied.
  12. 12. PAINTING PLASTERED SURFACE  At least,6 or 12 months should be allowed to dry the plastered surface.  To paint freshly plastered surface , alkali resistant primer paint should be applied.  Spot showing efflorescence should be brushed off.  Oil paint, silika paint , emulsion paint & cement paint mostly used
  13. 13. DEFECTS IN PAINTS

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