I have a part that I am working on that has threads on one end. It is a 3/8" rod that I don't want to rust. I decided to powder coat it to protect it. The only powder that I had was "TechShop Blue", so I went for it.
Before you powder coat a part, you can sandblast it to get all of the oils and grease off of it. Since the part has threads on one end, you don't want to sandblast them. Take some Kapton Tape (it is heat proof to 800 degrees). Wrap the threads with the tape to protect them.
Since any part needs to be grounded when you powder coat, wrap a small copper wire around the threads before you put the tape on the threads.
Step 1: Sandblast ;-)
To sandblast, all you need to do is open the cabinet, put your part in it, then close the door. Next, turn on the air pressure, and the blower. Put your hands into the gloves and pull the trigger. In few minutes, your part is sandblasted and clean as a whistle!
Step 2: Pre-Heat the Oven
Step 3: Prep the Powder
Pour the powder into a jar using the funnel.
Screw the powder jar onto the gun and turn on the power the the gun.
Step 4: Wash the Part After Sandblasting and Dry Out the Part
Hang the part in the pre-heated oven to dry it out.
After about 5 minutes, let the part cool so that it is no more than 100 F. degrees.
Step 5: POWDER COAT!!
Powder coating works by positively charging the powder as it comes out of the gun. You can see how easy it is to get it to stick to the metal. Click here to watch: http://www.youtube.com/watch?v=0x8aYUlh4O4
Step 6: Bake the Part / Then Cool
When the 12 minutes is done, transfer the part to cool.
That's all there is to it.
I now have a powder coated part -- I made it at TechShop!