Powder Coating Q&A: Powder Coating Assembled Parts

Do you have any ideas about how we could cure a powder coating without causing damage to the sensitive parts?


Facebook Share Icon LinkedIn Share Icon Twitter Share Icon Share by EMail icon Print Icon

Q. We currently use an air-dry liquid paint. We want to powder coat our parts for better appearance and durability, but we are concerned about the high temperatures needed to cure a powder coating. Are there any powder coatings that can be cured at a temperature below 200°F? If not, do you have any other ideas about how we could cure a powder coating without causing damage to the sensitive parts?

A. The lowest curing powder coatings are in the range of 250°F and that is for epoxy resin systems that do not have good resistance to sunlight exposure. You will need a polyester resin system to get the ultraviolet protection. The lowest temperature polyester products will probably need to be cured at 325°F or higher, so I do not think low temperature curing is going to help with the heat-sensitive parts.

Consider coating all of the metal parts before assembly. I have done this with more than one manufacturer and had excellent success.This requires a lot of changes to the manufacturing process, but the results are so positive that it is well worth the effort. Parts are coated inside the areas that overlap in assembly, so no rust occurs between two parts that lie flat against one another. Holes have some coating in them, too, providing some additional corrosion resistance around fasteners. The powder coating is a thermal-set material, so it will be much tougher than most air-dry products. If you store parts outside in a yard, you will be impressed by how much better they handle sun and rain compared with its air-dry counterparts.


Originally published in the April 2016 issue.

Related Topics


  • Masking for Surface Finishing

    Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.

  • Coating Thickness Measurement: The Fundamentals

    A review of available test methods, common applications and innovative instrumentation...

  • 2020 Vision: The Future of Coatings

    The year 2020 will be here before you know it, signaling the beginning of a new decade and bringing changes to the world as we know it.