Q&A for How to Powder Coat

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  • Question
    What is the easiest way to remove powder coat?
    Alvaro Mendoza, PhD
    Metallurgist
    Alvaro Mendoza, Ph.D., is a Metallurgist and the Owner of Mendoza Metallurgy in Portland, Oregon. With over 15 years of professional and research experience, Dr. Mendoza has worked in the aerospace industry in forging, casting, metal-making, and additive manufacturing primarily with nickel-based superalloys, titanium and steels. He currently runs a metallurgical consulting and education business that focuses on providing technical expertise to businesses of any size. He was recently featured on a podcast about why metallurgy matters. Dr. Mendoza received his B.S. and M.S. and Ph.D in Materials Science and Engineering, focus on Metallurgy from the University of Florida.
    Metallurgist
    Expert Answer
    Mechanical means is the easiest way—that means sandblasting, sanding, or some kind of gross removal technique. You can also do some research to see if there's a chemical solution designed to remove that specific coating (like how turpentine works for paint).
  • Question
    Can I powder coat inside car body but not outside?
    Community Answer
    Yes, but it will be difficult. You may find it hard to find a shop that has an oven wide enough to accommodate a car. Additionally, the powder will flow around the edges of a surface to the opposite when sprayed, which would result in heavy overspray outside of the car. This could be blown off, but you will be charged extra.
  • Question
    Could you please explain the reason why I should not cook food in the same oven I've used to cure the powder coating?
    Community Answer
    The fumes from powder coating are toxic. They also get reintroduced every time the oven gets turned on. You will need a designated oven for this. It's also dangerous to do this inside of the kitchen due to the fumes it produces while curing.
  • Question
    How many times is it recommended to re-use or recycle the powder paint, and what are the pros and cons about mixing powder paints from different providers?
    Community Answer
    You can reuse it as many times as you like. There are no real pros to mixing different brands. The cons are pretty simple. They don't all use the same formula so there are different bake times and temperature ranges and you might not get a consistent mix throughout.
  • Question
    Will the powder coating change color when heated?
    Community Answer
    Yes. It will go from a dull-colored powder to a rich, shiny, and smooth coat.
  • Question
    Does the powder coat paint stick to masking tape over areas of the metal that are not to be painted?
    Community Answer
    Depending on how thick the tape is, yes. If you use painter's tape, it will, but you will have to remove the tape before the part goes in the oven. If you use high-temperature tape, you can leave the tape on while it's in the oven, but will have to remove it very soon after you remove the heated part. This will give you clean lines much like using tape on a wall and removing it right after painting.
  • Question
    What kind of power coating should I use for a pistol? Do they make flat colors of powder coating?
    Community Answer
    You shouldn't powder coat a pistol. A ceramic coating (ex: cerakote) or chemical/electro plating process (hard anodize, chrome, etc.) is much more appropriate for the heat, stress, and wear and tear that a firearm can produce/suffer.
  • Question
    How do I repair my powder coating?
    Community Answer
    You should be more careful and avoid damaging it. Once damaged, you will lose much time trying to repair it, and it will never look as good as new. To repair it, you must re-powder coat it, but sand down the areas first.
  • Question
    What safety precautions should I take while handling this substance?
    Community Answer
    You should protect your skin and eyes with a tyvek suit, gloves, and safety goggles. You should also get a good dust mask and perhaps a face shield. Electrostatic paint is not toxic, but it can dry out you skin and cause irritation, especially when inhaled.
  • Question
    I need to make several gates 36" x 60". Can I use a heat gun to set a thermoset coating?
    Community Answer
    That will take forever. You need an even heat source for the molecular bond.
  • Question
    Can I powder coat a face guard on a football helmet?
    Community Answer
    Yes, providing you can get the face mask down to bare metal, and you use a thermoplastic powder.
  • Question
    Can I powder coat over plastic filler?
    Community Answer
    No. It won't stick, as it requires a clean metal surface for the charge to travel through.
  • Question
    Can I powder coat over a painted metal surface?
    Community Answer
    No, the powder won't stick to it.
  • Question
    I’m using an umbrella base powder coated steel frame to make a trash can turkey stand. Will this be safe?
    Community Answer
    If it was powder coated with a thermoset powder, it can take a high heat; a thermoplastic will re-melt at much lower temps. Both produce toxic flames at higher temps. I would caution you against this!
  • Question
    Can I burn off powder coating?
    Community Answer
    Yes you can. There are special ovens for this operation. They turn powder coating to ash that can be removed easily when finished.
  • Question
    How do I apply two colors, for instance a blue field with a yellow border, to the same piece?
    Community Answer
    That is nearly impossible because powder coating changes its form during the curing processes. It is not like paint that can be masked off for graphics or multi-tones. If you used a metal foil tape where the adhesive will not release under heat this may prevent runoff of the powder coating but attempting dual colors should be left to an expert and expect to pay handsomely. Reason: Prep and cleanup of the piece and of course you would have to be satisfied with the outcome. Most pro's I know only do 1 color process.
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