Metal Finishing Guide Book


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icated spray booth. While this will not stop the odors, it will force the solvents through an exhaust stack, approximately 30 ft above ground level. This will considerably minimize the odor. If the painters use very small quantities, such as one quart per day, they might not be required by regulation to install a paint spray booth. Please bear in mind that every state has its own regulations regarding when one is required to install a spray booth. However, you can report the nuisance odors to your local air quality control district. If the inspectors agree that this is a nuisance condition, they can require the painters to desist from painting, or they can ask the painters to do their work after hours when you and others have gone home for the day. FEDERAL STANDARD COLOR VS. PRODUCT NUMBER Q: I often receive blueprints that request the supplier to powder coat per Fed. Std. 595, Color #26231. Can you please explain to me the difference between a Fed. Std. 595 color and a powder coat color number? A: Federal standard colors are ones by which the U.S. government specifies its colors. It is a long-standing color standard used by architects, engineers, and others. Colors can be purchased in low-, medium-, and high-gloss ranges. The standard can be applied to any type of paint, alkyd, acrylic, epoxy, polyurethane, or any other resin type. The paint can be liquid or powder. You might like to read more about Fed. Std. 595 at Powder and liquid coatings can be purchased to the Fed. Std. 595b standard, to a manufacturer���s unique color range, or to a company���s own custom color. For instance, most large corporations, such as Deere & Co., Caterpillar, Coca-Cola, Pepsi, Federal Express, UPS, United Airlines, etc., design their own unique colors. Therefore, the color numbers given by paint manufacturers [suppliers] are unique to that manufacturer. If two or more paint manufacturers make a color for the same corporate customer, the color number might be assigned by the customer. On the other hand, it is equally possible that each paint manufacturer will assign its own number to that color. Generally, custom colors do not carry the same nomenclature as Fed. Std. 595 colors. ACHIEVING A GOOD-LOOKING AUTOMOTIVE FINISH Q: I am trying to paint my car with Rust-Oleum semi-gloss black paint. The label on the can says to mix the paint with mineral spirits. How much should I use to get a good finish? A: You should add as little mineral spirits as possible. I suggest that you try spraying some of the paint without adding mineral spirits. If you get too much orange peel then add a small amount and try again. On the one hand you want to avoid getting unacceptable orange peel, but on the other you don���t want the paint to be so thin that it runs down the doors and vertical surfaces. The label on the can should tell you the maximum amount that you can add. Bear in mind that your local environmental agency might have VOC regulations that prohibit you from adding any thinners to your paint. ALTERNATIVES TO CHROMATE-CONTAINING PRETREATMENTS Q: I am writing to ask if you have any information about specific plumbing fixture companies that use alternatives to hexavalent chromium in their finishing processes. We are a ���green��� 609

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