We used to. It is tough having to heat each spoon, one at a time with a heat gun. We then used a powder paint airbrush, the paint holds up great after baking, but it is time consuming.
Now we just use acrylic paint and still bake to cure. Then we use a spray clear coat over top. The powder paint is definitely more durable, but the acrylic is much easier to use and paint cleaner lines/patterns etc.