Airless Spray – Roof Painting

Using an airless paint sprayer can save you time, energy and provide a smoother, higher quality finish.

  • If you want to Hire an Airless machine then you are at the right place, we have Various Electric and Petrol Machines available for hire.
  • If you wish to Purchase a machine then please contact Martin at  HRM Services        our specialist supplier of Quality machines. 
Description
  • Adjustable pressure for different types of airless spraying.
  • Over-spray is much less than budget airless paint sprayers – but it is still there.
  • Mainly for Outdoor use but it can be used indoors by experts as well.
  • Lightweight which makes it more comfortable to transport and use..
  • Easy to use and clean (it is critical that the machine is rinsed and cleaned directly after use to prevent costly damage)

Application technique

The correct attitude of the spray fan is always to maintain the fan angle at right angles to the
plane of work. Any deflection, either horizontally or vertically produces at one side a thinner
application, but loads the other side with an over thickness, both unsightly and likely to run.
The correct technique is with the gun at right angles and always parallel to the work face with
the gun travelling at the speed that the spray fan slightly under-covers the surface. The return
spray, also parallel, overlays by 50% thus, stroke by stroke, attaining full attractive coverage
of the surface.
This sounds complex but is actually easy to do. However, it is not easy to correct those
operators that persist spraying with a loose ‘wristy’ action. Short of breaking their arm and
applying a plaster cast, this remains a difficult habit to correct. Left handed people rarely
have this problem, possibly because they are already living in a largely right handed world
and are more receptive to adaptation.

Pressure Adjustment

Airless pumps have a fluid pressure adjustment and the ideal situation is to have selected the
best tip for the material being sprayed and adjusted the pressure to properly atomise the spray
flow. Because the spray tip opening is elliptical, too little pressure prevents full atomisation
and a spray pattern is produced with tails. The pressure should increase until the fan forms
without any tails and thereafter increased by another 10%.
This represents ideal conditions and allows for line pressure drops, changes from climbing
scaffolds and some latitude for viscosity changes mix to mix. The critical statement –
‘atomise’ – the lowest pressure necessary to atomise the material.

HOW TO CLEAN VIDEO – Very important to watch !

Water based paints – use water to clean the machine.
Solvent based Paints – require 20 Litres of solvent to clean the machine and then rinse the machine with water and sunlight Liquid.
If you are using a solvent based paint you need to bring the your 20 Litres of solvent cleaner with before we issue the machine to make sure that you will be able to clean the machine properly. Unfortunately we need to be extremely cautious when it comes to ensuring that the correct cleaning procedure is followed immediately after use to avoid high cost repairs. The machine cannot be cleaned after the paint dries

 

Couple of ideas how to use

Be aware of what can be done but videos can be deceptive, if not done correctly there will be over spray on the windows doors, ceiling, floor everywhere  and  you are supposed to back roll it with a roller when spraying to blend in the spray lines that are created.
It is not necessary to back roll if spraying a roof, the overlap lines will not be visible.

Cleaning Instructions
  • It is critical that you clean the airless Properly Directly after use - do not wait for the paint to dry
  • Water based paints - use water to clean the machine.
  • Solvent based Paints - require 20 Litres of solvent to clean the machine and then rinse the machine with water and sunlight Liquid. If you are using a solvent based paint you need to bring the your 20 Litres of solvent cleaner with before we issue the machine to make sure that you will be able to clean the machine properly.
  • Unfortunately we need to be extremely cautious when it comes to ensuring that the correct cleaning procedure is followed immediately after use to avoid high cost repairs. The machine cannot be cleaned after the paint has dried.
  • HOW TO CLEAN VIDEO - Very important to watch !
  https://www.youtube.com/watch?v=SgRRmGuBD-I