Finishing on Top of Polyester Powder Coated Cast Aluminum
Question: I want to apply a finish on the cast aluminum parts consisting of polyester powder coating.
I want to apply a finish on the cast aluminum parts consisting of polyester powder coating. Before painting, the parts are finished with polyester filler and hardener and then are sandblasted. Will the polyester/epoxy powder cover the surfaces uniformly or is it possible due to the filler using to have gassing on the surfaces? Is the compatibility between the filler and polyester/epoxy powder good? D. V.
You will most likely experience outgassing through the powder coating using this kind of filler. Additionally, you will have poor electrostatic attraction of the powder coating using this filler. Try using Lab Metal from Alvin Products and you won’t have either problem. This filler is aluminum based, readily sanded, is conductive for good grounding, and heat stable. They are listed in www.pfonline.com/suppliers.html.
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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.
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