Application

• Paint can be applied as a solid, a gaseous suspension (aerosol) or a liquid. Techniques vary depending on the practical or artistic results desired.
  As a solid (usually used in industrial and automotive applications), the paint is applied as a very fine powder, then baked at high temperature. This melts the powder and causes it to adhere (stick) to the surface. The reasons for doing this involve the chemistries of the paint, the surface itself, and perhaps even the chemistry of the substrate (the overall object being painted). This is commonly referred to as "powder coating" an object.
  As a gas or as a gaseous suspension, the paint is suspended in solid or liquid form in a gas that is sprayed on an object. The paint sticks to the object. This is commonly referred to as "spray painting" an object. The reasons for doing this include:
  The application mechanism is air and thus no solid object ever touches the object being painted;
  The distribution of the paint is very uniform so there are no sharp lines;
  It is possible to deliver very small amounts of paint;
  A chemical (typically a solvent) can be sprayed along with the paint to dissolve together both the delivered paint and the chemicals on the surface of the object being painted;
  Some chemical reactions in paint involve the orientation of the paint molecules.
  In the liquid application, paint can be applied by direct application using brushes, paint rollers, blades, other instruments, or body parts such as fingers.
  Paint application by spray is the most popular method in industry. In this, paint is atomized by the force of compressed air or by the action of high pressure compression of the paint itself, which results in the paint being turned into small droplets which travel to the article which is to be painted.
  Rollers generally have a handle that allows for different lengths of poles which can be attached to allow for painting at different heights. Generally, roller application takes two coats for even color. A roller with a thicker nap is used to apply paint on uneven surfaces. Edges are often finished with an angled brush.
  After liquid paint is applied, there is an interval during which it can be blended with additional painted regions (at the "wet edge") called "open time." The open time of an oil or alkyd-based emulsion paint can be extended by adding white spirit, similar glycols such as Dowanol (propylene glycol ether) or commercial open time prolongers. This can also facilitate the mixing of different wet paint layers for aesthetic effect. Latex and acrylic emulsions require the use of drying retardants suitable for water-based coatings.
  Paint may also be applied by flipping the paint, dripping, or by dipping an object in paint.
  Interior/exterior house paint tends to separate when stored, the heavier components settling to the bottom. It should be mixed before use, with a flat wooden stick or a paint mixing accessory; pouring it back and forth between two containers is also an effective manual mixing method. Paint stores have machines for mixing the paint by shaking it vigorously in the can for a few minutes.
  The opacity and the film thickness of paint may be measured using a drawdown card.
  Oil-based paints when dry tend to be very durable, washable, and long-lasting. The paint would take about almost 1 day to dry.
  Water-based paints tend to be the safest, and easiest to clean up after using—the brushes and rollers can be cleaned with soap and water.
  It is difficult to reseal the paint container and store the paint well for a long period of time. It should be stored upside down, for a good seal. Storage should be in a cool dry place, protected from freezing.
  Proper disposal of left over paint is a challenge. Sometimes it can be recycled: Old paint may be usable for a primer coat or an intermediate coat, and paints of similar chemistry can be mixed to make a larger amount of a uniform color.
  If it is necessary to dispose of paint, one approach is to dry it, either by leaving the lid off until it solidifies (which tends to work well only for small quantities), or by pouring it into a disposable drying device, such as a piece of plywood surrounded by a lip. Many commercial paint stores also carry paint hardeners which will work for both latex or oil based paints and is useful for larger quantities. If available, clay based cat litter will do the job as well. Once dry, the paint may be discarded with normal trash (just make sure to keep the lid off so it won't be refused during pick up). Wet oil-based paint should be treated as hazardous waste, and disposed of according to local regulations.[5][6]
  Old paint can chip off the surface and become a "paint chip".