Yep Daza there is a limit to what you can powdecoat!
In powder coating, the powdered paint may be applied by either of two techniques.
(a)The item is lowered into a fluidised bed of the powder, which may or may not be electrostatically charged
or
(b)The powdered paint is electrostatically charged and sprayed onto the part.
The part is then placed in an oven and the powder particles melt and coalesce to form a continuous film.
Obviously you couldn't powdercoat something that would melt at the baking stage ie plastic