If you own metal assets on Guam, proper coating specification is something you should understand. The right coating system determines how long your coatings will last in Guam's environment.
What is corrosivity classification?
Coating professionals classify environments by corrosivity — from very low (like indoor climate-controlled spaces) to marine extreme (like offshore platforms and coastal structures). The classification then determines coating systems, surface preparation standards, and dry film thickness ranges for each environment.
Guam's Corrosivity Class
Most of Guam falls into C4 (high corrosivity) or C5-M (marine extreme). The constant salt spray, high humidity, and intense UV make Guam one of the most corrosive environments in the United States. Using a C3 system on Guam guarantees premature coating failure.
Why Proper Specification Matters
Using the wrong corrosivity class is the most common cause of premature coating failure on Guam. A moderate-duty system applied in a marine extreme environment will fail within 2-3 years instead of lasting 15+. Proper specification — based on actual environmental conditions — is the foundation of long-term asset protection.