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6 If you can score a used oven on the cheap then great, but I often use this small toaster oven that I purchased for less than $40. Just never use a gas oven, and don't use an oven you normally cook in. Preheat the oven to 400 degrees, insert the coated part and watch for the powder to "flow out" or melt and begin to look shiny. After all the powder all over the part has flowed out, allow it to cure at 400 for an additional 20 minutes and then cool slowly.