The work involved in powder coating is about 90% Prep. ¹⁾
It's good to bake parts before powder coating at a higher temp than you would powder coat at to bake the impurities out of it.
Also you can flash heat the parts with a propane torch to clear any moisture that may have been attracted to the cleaned part. ²⁾
And preheat any tight areas and drop the powder on the gun as you coat to make sure that it gets coverage there as well.

You can use a gutted and steel lined upright freezer for an oven. ³⁾

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Homemade powder coating cabinet made by XLFORUM member simeli:
Using 5000 watts of heater element it reaches 450° in 15 minutes.

I allowed it to stay hot for 45 minutes before shutting it down 2 hours later it was still 180 degrees inside the box.

• 220V, 108 sq. ft. of insulation, 33 cu.ft
• 20 gauge steel for the heat box faced with cement board
• 4 inches of space packed with 70 sq.ft. of insulation
• The door face is 20 gauge steel (as is the surroundings) with 1-1/2“ of space with 30 sq.ft. of insulation packed into it.
• 1/4” gasket on the surroundings.

Door latches were not installed in the pics below but jack straps were used in their absence.
Total cost: about $497 (not counting the door latches)

The heat is supplied from the bottom and one side causing a natural air rotation inside the box.
In testing, ther was around 10 degree difference in the temp of the rails (rack supports).
(which is actually less than the temp rise and fall between heating cycles)

Homemade powder coating cabinet. 5)