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Column Update: Why Are Exterior Walls and Roofs Typically Painted with Three Coats? Understanding Each Coat’s Role and the Types of Primers
When repainting exterior walls or roofs, a three-coat painting system is commonly used.
But why are three coats necessary? Does applying more coats always result in a longer-lasting finish?
Painting is not simply about adding layers of color. Each stage—the primer coat, intermediate coat, and topcoat—serves a specific purpose in ensuring that the coating system delivers its intended performance.
In our latest column, we explain why three-coat systems are commonly used and explore the role of each coat from a paint manufacturer’s perspective. We also introduce the differences between primers, sealers, and fillers, along with the key factors that influence coating quality and durability.
■ Key Points
・The roles of primer coats, intermediate coats, and topcoats in a three-coat painting system
・The differences between primers, sealers, and fillers, and how to select the appropriate product
・Does applying more coats improve durability? The importance of proper application conditions and coating thickness
Achieving a high-quality finish and long-lasting protection requires more than simply increasing the number of coats. Selecting the right coating products and following the recommended application specifications are essential.
This article provides useful insights for homeowners planning to repaint their properties, as well as painting contractors and professionals looking to explain coating systems more effectively to their clients.
▼ Read the full column here
[Why Are Exterior Walls and Roofs Typically Painted with Three Coats? Understanding Each Coat’s Role and the Types of Primers | Mizutani Paint Co., Ltd.（Why Are Exterior Walls and Roofs Typically Painted with Three Coats? Understanding Each Coat’s Role and the Types of Primers | Mizutani Paint Co., Ltd.]