This Instructable explains how to use an old electric oven and reasonably-priced kit to powder-coat at home:

I’ve seen some cool candleholders around town made from plumbing fittings so this holiday season I made a bunch of powder coated iron pipe candleholders for friends. I’ve always wanted to try my hand at powder coating since it produces a beautiful durable finish and this is a project that lends itself very well to powder application. The candleholder tops swivel for several different candle configurations and the threaded fittings allow you to screw the candles in for a good hold.

Seems much more durable than the flaky paint jobs I’ve been putting on metal projects!