I made it at TechShop (http://techshop.ws)
Challenge: Most non-metallic materials are without the needed electric conductivity to support the electrostatic powder coating process.
Solution: wash the object with water to provide temporary surface conductivity prior to coating.
Prepare the objects to be powder-coated. In my case, I cut big numerical number patterns from a wood board as well as from a laminate floor panel using a scroll saw. They are for replacing my older & smaller address numbers above my garage door.