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Yeah, the answer is it depends on the powder. Some is more brittle and some more flexible. Perhaps its the way its applied but I think it is the material.
See #16:
16. Can coil springs be powder coated?
Powder coatings are very flexible, and can flex with the metal as the spring, coils and recoils to its stationary position. Also epoxy, acrylic and hybrid powders provide excellent adhesion and hard-ness for improved resistance to chipping, abrasion, corrosion, and chemicals; and it’s flexible enough to be formable without cracking.
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