When I redid the 83 D150 I had a buddy at work that was wanting to learn powder coating. He had acquired an electric range with a working oven, and if I bought the powder and delivered clean blasted parts to him he would do the powder coat process for free. Did the slant six valve cover, power steering brackets, belt pulleys, and other small brackets. Ten years later it is all still really nice. He found tricks like wiping the blasted parts down with solvent and warming the parts prior to putting on the powder made a difference. He was using an inexpensive gun from Eastwood and an electric oven from Goodwill. Bigger parts like the sway bar need a bigger oven, so I paid for that. But parts the size of valve covers and down can be powder coated with out much capital investment.
