Bodywork varnishes
Introduction
Automotive painting is a job that is done all over the world, both in automotive factories and in repair shops.
Since the creation of the automobile, paint was used to decorate and beautify it, to give it a more attractive appearance. But that is not the main function of paint, since the most important of all is the prevention of corrosion (oxidation) to the metal.
Function
In every vehicle we find three different layers, which fulfill different functions, which are the following: - Wash Primer.
It is used to improve adhesion on non-ferrous surfaces.
1° Anticorrosive paint.
Also called base paint, filler or primer. It helps prevent rust and gives a matte tone, which helps the sheet metal worker find possible imperfections on the surface to correct them. The basic color used is gray, but there are others such as yellow, blue and white.
Some paint brands manage the shadow value in the primer, that is: a primer with a tone on the gray scale, ranging from a white tone to a black tone, passing through different intensities of gray. By using a primer with the appropriate shade of gray we help the color to be applied cover faster and not be distorted. There are also tintable primers, to which ink can be added so that they acquire a tone similar to that of the color paint to be applied, also helping the color paint to cover quickly and to ensure that the tone is not distorted.
- 2nd color paint.
This gives the color desired by the manufacturer or the client, giving it a completely different appearance. Normally solid color paints give a semi-gloss finish and pearl paints give an opaque finish.
Currently there are two types of color paint technology: Solvent-Based and Water-Based.
Solvent-Based paints have petroleum derivatives as part of their formulation, such as organic solvents, which present a large number of Volatile Organic Compounds (VOCs) that are harmful to the ozone layer due to their volatility. Among these solvents are methanol, ethanol, acetone, chloroform, toluene or xylene, etc. An advantage of these paints is their rapid drying due to the rapid evaporation of the solvents they contain.
Water-Based paints have DI (Deionized) Water as their main formulation base and due to this characteristic it is less harmful to the environment. However, its drying is very slow since the evaporation of water is slow and that is why it is necessary to use special ovens or lamps to help cure it.