CHAPTER 2 
CHAPTER 
OVERVIEW 
Exterior coatings are vital protective systems, but 
they do not last forever. Understanding how and 
why they fail is essential for protecting your building 
and planning the right maintenance at the right time. 
This chapter explains the science behind coating 
weathering and deterioration, the stages of coating 
failure, and the many environmental factors that 
influence performance-especially 
in Hawaii. 
With this knowledge, you can make informed decisions 
that extend the life of your building's exterior and 
protect the value of your investment. 
41 -
f) 
KEY TAKEAWAYS 
Why exterior 
How modern 
coatings are much 
coating systems 
more than 
protect the 
After reading this chapter, 
decorative finishes. 
materials beneath 
you will understand: 
Exterior coatings are designed to shield building materials 
from the environment. They reduce moisture intrusion, 
resist ultraviolet degradation, slow corrosion, and protect 
against weathering and biological growth. 
When properly selected, properly applied, and properly 
maintained, coatings preserve the appearance, durability, 
and long-term value of your property. 
In many ways, exterior coatings 
function as the building's 
first line of defense. 
them. 
8 e '9 
Why all coatings 
The environmental 
How recognizing 
eventually 
processes that 
early signs of 
weather and 
contribute to 
deterioration can 
deteriorate. 
coating failure in 
help extend the life 
Hawaii. 
of a building's 
THE SACRIFICIAL NATURE 
OF EXTERIOR COATINGS 
Coatings are designed to weather-so 
the building 
beneath them does not have to. 
Sunlight, rain, wind, heat, and biological activity 
constantly test the coating. Over time, these 
exposures gradually break down the coating's 
protective performance. 
This is not a failure of the coating; it is evidence that 
the coating has faithfully performed its purpose. 
exterior. 
The goal of stewardship 
is to recognize 
when the protective 
system needs 
attention-before 
the building itself 
begins to deteriorate. 
CHAPTER 2 
I 
HOW EXTERIOR COATINGS ACTUALLY FAIL 
STEWARDSHIP TODAY VALUE TOMORROW 

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