Project Description

Preparation, Spray Painting a Residential Roof

Why Spray Paint?

In airless roof spray painting, the fast-moving high-pressure liquid stream provides the energy necessary to overcome the fluid’s viscosity (resistance to flow) and surface tension (a force that bonds the surface of a liquid together) to form a fine spray.

In the depiction of spray from a gun, high pressure forces fluid through a small nozzle (spray tip). The fluid emerges as a solid stream (sheet) at a high speed. When the solid stream hits the air, it becomes disrupted. This disruption breaks the fluid into fragments initially, then ultimately very small droplets that form the spray pattern.

Many contractors prefer to use airless sprayers for several reasons, the most popular being:

• • Speed—Airless spraying is faster, thus, more jobs can be completed in less time, using less labour. Airless spraying is up to 10 times faster than brushing or rolling.
  • Quality—Airless sprayers produce an even coat of paint on all types of surfaces, leaving a consistent and high-quality finish.
  • Versatility—Airless sprayers can be used for a wide range of coating materials, including interior and exterior jobs, and can easily be transported from job site to job site.