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Ask the Expert Question-and-Answer Archive by Ron Joseph April, 2008 Liquid Paint Over Powder Q: I am trying to get a new painting system where i paint my metal pieces with powder coating (e-coat+powder) and I faux finish them with liquid paint, to be specific Nason B/C from Dupont. I need to know what to do to get a good percentage of adhesion. A: Is Nason B/C paint a polyurethane? If so, you might need to scuff sand the powder coating before applying the polyurethane. Please get back to me with the answer so that I can try to give you a more definitive answer. Also, what type of powder coating are you using; polyurethane, polyester, epoxy, etc.? Q: Nason B/C from Dupont is not a Polyurethane, it’s probably and acrylic or a lacquer paint. The powder coating is a polyester with no texture. A: The only method I can think of is to scuff sand the polyester powder to a matte finish and then apply the Nason B/C coating. I strongly suggest that you experiment with a few small pieces. After applying the coating wait approximately four days and then test for adhesion. A more sensitive test requires that you soak the coated parts in a bucket of water for 24 hours and then repeat the adhesion test. If the coating passes the wet adhesion tests, in my opinion you are likely to get good performance in the long term. Ron Joseph
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