Epoxy-polyester (Hybrid) are general purpose coatings that have limited exposure to sunlight. These are the widely used powder Coating. They offer excellent hardness and have the best chemical and corrosion resistance of all available powders. Another plus point of this type of powder is its ease of use and awide range of cure schedules. Epoxies adhere to metals extremely well, with various pre-treatments of the metal providing excellent adhesion, including phosphate and sandblasting.
The drawback of Epoxy-polyester (Hybrid) powders are that they do not uv resistance well. Exterior exposure can cause them to fade and chalk in the sun and will oftenstart to degrade on the surface after a few months. This makes epoxies better suitedto indoor applications.A final note on epoxies is that many primers are epoxies due to their adhesion strength and rust resistance. Since they do not handle theweathering conditions well, their use as a pre-coat underneath another powder coating type to utilizes their strengths while covering their weaknesses.
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