Flexible plastic coatings or thermoplastics do not harden after they have been applied. When these coatings are heated up towards their melting points, they soften again. Even after many years. Throughout the operational lifespan of the coating they remain flexible.
We use fluidized bed or electrostatic powder techniques to apply elastic coatings to metal surfaces that deform or have to remain flexible, such as springs. We apply both thin and thick layers of these coatings to components that are subject to increased wear and tear. This is because thermoplastics are more resistant to e.g. cavitation than thermosetting plastics.