PAINTING OF AUTOMOBILE

Introduction: The corrosive nature of a metal used in a motor body construction, necessitate the application of an anti corrosion coating. For this reason the painting should be done.

Function of Painting:

1. It reduces the corrosion and protect the vehicle body.

2. It is used for cleanliness.

3. It is used for esthetic appearance.

4. It is used to reduce the friction due to the aerodynamic drag and allow the vehicle in stream lining.

5. It is used for identification purpose.

Requirements of Good Painting:

1. It should be anticorrosive nature.

2. It should protect the hidden parts also from the corrosion.

3. It should have esthetic appearance.

4. It should be smooth finish for stream lining.

5. It must reduce the aerodynamic drag.

Main Constituents of paints:

1. Pigments

2. Drying oil

3. Thinners

4. Dry Extenders

5. Plasticizers

6. Resins.

Reason for failures of paints:

1. Not proper cleaning of body before painting

2. Not covering dents or spots.

3. Not using of proper good quality paint

4. Not applied the pretreatment with zinc phosphate.

Different Types of Painting

1. Spray paint

2. Hand paint

Spray Painting procedure: Now-a-days spray paintings are largely use. The procedure is as follows:

1. First of all the old paint should be scrapped with the help of scrappers

2. If there is nail or any obstruction they will be removed with the help of pincers

3. The removal of old paint must be by application of caustic soda solution and spirit solutions.

4. In some portions heating is necessary with the help of blow lamp for removal of old paint.

5.The surface should be cleaned from dirt, dust, rust, grease etc.

6. The surface should maintain perfect level from any kind of bends.

7. Then once again clean with red oxide.

8. After wards duco paints or delux paints or required colour may be sprayed on the vehicle as the primary coating.

9. After first coating is over we must see the variations of the surface clearly and apply second coating and it will finish the painting job and gives beautiful appearance.

10. Then decoration and letter writing finishes the body paint.

11. Finally polish the vehicle thoroughly.