National Paints

Application methods

Four main methods are used in painting. The choice of method depends on the type of coating to be applied, the effect on adjacent areas and the degree of skill of the personnel.

1.Brush
Brushes should be selected:

for low viscosity paints to yield low applied film thickness.
for most primers, particularly where surfaces have tiny irregularities that may be missed by roller or spray or where penetration is especially important.
for corners, edges and odd shapes.
for small areas.

2.Roller
Rollers should be selected:

for topcoats where the stippled effect produced by roller is acceptable.
for jobs where skilled brush painters are not available.
for large flat areas where spraying would create a fire hazard.
for textured coatings.

3.Conventional Spray

This technique mixes a jet of air with a stream of paint to propel a fan of paint droplets towards a surface. The mix of air with the paint particles gives high turbulence however and considerable "bounce back ".Air atomisation of paint can thus result in considerable overspray. Therefore not only must adjacent areas be protected but paint losses may vary from 20%to 40%on steel and paint operatives must wear protection to avoid paint mist inhalation. The technique particularly suits low viscosity paints and is most commonly used for the application of conventional decorative paints and zinc silicate coatings.
4.Airless Spray