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. 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.

Answer:

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.