Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition © Pearson Education...

Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition

© Pearson Education Limited, 2008. Copying permitted for purchasing institution only. This material is not copyright free.

High volume low pressure spray equipment

●HLVP spraying systems are light, mobile and easy to clean, and they can produce a high quality job in a short time.

●Health and safety is vital when spray painting. You must use the correct PPE, prepare the site well and check all equipment.

What PPE do you need when spray painting?



Starting off

There are many types of HLVP spray gun, but typically the coating is held in a pressure vessel and fed in using compressed air.

<Insert Figure 15.1>



Types of spray gun

There are a variety of types of spray gun:

HVLP spray gun

system

What are the advantages and disadvantages of each type of spray gun?

Air spray gun Airless spray gun



Preparing areas for spraying

Overspray is one of the main disadvantages of spray painting. Your preparation needs to be meticulous if you are to avoid overspray problems.

How would you explain what the term ‘bounce back’ means?

<Insert Figure 15.2 – Bounce back>



Masking

A range of materials will help protect surfaces from being damaged, including:

●polythene sheeting, dustsheets, masking paper

●hardboard, corrugated plastic, cardboard

●polythene bags, masking tape

●specialist spray shields How would you protect the items in the illustration?

<Insert Figure 15.4 – Items to protect>



Applying water-borne coatings

Make sure that:

●the paint is at the right viscosity

●you follow the manufacturer’s instructions

●everything is kept clean

●you have the proper training

●you get the spraying action right!

<Insert Figure 15.6 – Spraying correctly/incorrectly>



Cleaning and storing equipment

If you have used water-based coatings:

●flush with water then mineral spirits

●leave the pump (machine) gun and hose filled with mineral spirits

●shut off and unplug the sprayer●turn pressure relief prime valve to ‘prime’

●return prime valve to spray position

<Insert Figure 15.6 – Spraying correctly/incorrectly>

Why should you turn the pressure relief prime valve to ‘prime’?

Painting and Decorating NVQ and Technical Certificate Level 2, 2nd Edition © Pearson Education...

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