In this case, it would be best to do a coat of zinc-rich primer before doing your color coat. Now paint will adhere much better to the surface. Two coats pretty much assures 100% coverage. I use an 18 ga satin coated material clean from the mill currently and finish spray enamal with great success, do you think I need to phosphate if the satin coat is clean and outgassed? Any thoughts? Let it sit for few minutes and then rinse in with clean water. http://www.tristatefabricators.com/PowderCoating.htm, Great info. These cast aluminum parts can really dress up your engine bay once powder coated, but they can also be VERY difficult to get 100% clean when you try to powder … This can be done by media blasting, grinding, sanding, or with a chemical process. If the surface is not properly prepared, your new paint job may soon peel off. The preparation steps below will eliminate 99% of any issues you may be having in your powder coating work. With that said, anything with moving parts must be taken apart and coated separately, then reassembled after. In this video Matt is going over how to prep motorcycle parts for powder coat using blast cabinets. Don't strip the coating off; the goal here is to slightly roughen the metal coating to make sure the new paint sticks to … Gail - thank you. I took them back to the guys that powder coated them originally and they agreed they must have no got all the rust "since the parts are cast metal". thibshman, EnviroServe Chemicals, Inc. has been providing the aluminum powder coating industry with high quality pretreatment chemicals and processes for many years. so when are the new articles on how to actually spray the powder coat and the proper way to cure it followed by how to shoot 2 or more coats, coming up? This will add an additional layer of protection and the zinc in the primer will also help prevent rust from forming. It also preps the surface of the aluminum for better powder coat adhesion. Copyright © Re: To what grit do I sand aluminium before powder coating? Most powders will have good inner-coat adhesion, but some may not, and you will want to confirm that. We don’t want to sand blast as it gives an orange peel finish and bead blasting while an option is a bit costly and maybe? Training is needed to help operators better understand film-build control. Usually it just calls for 400 grit sandpaper. In some cases, you may need to do some light sanding to promote inner-coat adhesion. As usually I am behind on all my projects and they sit in my shop for around 8 months. Powder Coating: The Complete Guide is an educational site for powder coaters. Is the zinc phosphate you use like a paint? The coating thickness is also a factor. You will need … Here's the link: (copy and paste into browser) https://www.facebook.com/groups/1573631509530937/ It is a moderately active and there are several very knowledgeable powder coaters that answer questions. Generally powder coating may be regarded as an environmentally favoured method of applying a finish particularly as it avoids the use of solvent-based paints avoids overspray wastage, and any unused powder may be fully recycled and used again. Unlike liquid paint, powder coating doesn’t require a solvent. When I went to reassemble them (Axles and housings) the showed rust bleeding through. Looks like when I powder coat a water drop get under the powder and while in oven it evaporates. Powdercoatguide.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. 1) Pre-treat the Aluminum … . Step 1 Sand the powder-coated metal lightly with 220-grit sandpaper. Surface Cleaning— … Sometimes the flow characteristics can be altered to provide smoother appearance but the performance needed from the powder may force the formulator to balance different ingredients to achieve the necessary properties, and that may mean more orange peel. They typically come with a factory coating of I assume lacquer. Have you ever seen any coloring issues using AL 5000 material. Just to avoid any possible annealing of the aluminum. :), Thank you for sharing, I think we can use combine compressed air solutions for Clean surface. I'm just hoping that I'll be able to figure out what to do with your advice. Can you link me to the powder coating group page or tell me the page so I can join. Powder-coating paint is usually applied as a dry powder to steel and aluminum … 180 grit will be fine but if you have left some nicks on the surface if they are deeper than the 180 grit lines they might still show after coating . SSPC-SP3 (Power Tool Cleaning) Mechanical methods of surface preparation… I would prep it according to the spray enamel you are using. Determine the type of material you are going to powdercoat and then select a suitable powder for the finish. Disassembly is not always required, it really depends on what you are coating. Work had on first-pass yield so you do not have to invest the material and labor required to apply a second coat. It will be more challenging to get coverage due to the insulating properties of the first layer, but you can get it if you follow a few simple steps: increase flow rate slightly, pull the gun back a little, and control micro-amps between 20 and 40. Sandblasting would be best, followed by what the instructions say, followed by phosphating. We are purchasing new powder as it was significant issue with one color. Thanks! When powder coating, it is very important that the item you are coating is completely clean of oils, dirt, paint, rust, corrosion, and damaged plating (zinc, nickel, chrome, etc). Also are you sure the air lines you are using for your powder coating gun are clean and free of oil/moisture? Media blasting is usually done after outgassing which removes most contaminants and oxides. Do not skimp or rush these steps, preparation is 90% of the work for a good finish. In many countries, it is called Methylated spirits. HiAppreciate all the info you have put on this site.One question - reading the above prep process its saying to sandblast / apply zinc phosphate coating and then clean with denatured alcohol...the zinc phosphate prep product I have (KBS rust blast) leaves a light powdery zinc phosphate coating that I'm thinking will get scrubbed off if I clean the part afterwards. Application is a key part of the smoothness of the powder layer. how to prep wheels, fix curb rash and get them ready for powder coat or paint! After these steps, your part is ready to be powder coated. If the film is too thin or too thick, the distribution of the particles may not be correct to produce the smoothest film. Food-safe pretreatment of aluminum before powder coating July 3, 2018. Keep in mind that outgassing only really needs to be done on items that are cast aluminum, cast iron, magnesium, etc, items that have spent a long time in a greasy/oily environment, or items that have been exposed to salts. thanksrzx. 2. Processes for Preparing Aluminum for Powder Coating The key to preparing the substrate is removing the oxide layer, providing a pure metal surface for the coating to which to bond. On modern automobiles the majority of the bolt on parts (and even some of the major engine parts!) Any other process you might suggest we try? Thanks! Is there any extra precautions you might recommend that I can take to make sure I have them ready for the powder or would it be beneficial to second coat these types of parts? We want to be able to take on any job, but we have had some failures with coating aluminum parts that are used for outdoor products. A: Yes, it is a common practice to recoat a powder coated part, but there are a few steps you should take to ensure a good job. Cleaning. Step 2 – Chemically clean and potentially etch the surface for the Powder Coating to be applied The next step to preparing your product for powder coating is chemically cleaning and pretreating … Does it happen with all powders or just one? I've been wanting to get some powder coating done in my basement, but I just wasn't sure where I should start. What is an appropriate surface prep for an aluminum part which will be coated with an FDA approved powder coat for a food … How to Powder Coat Aluminum Wheels - TechShop: I made it at the TechShop, well.. Sorry for the delay, thanks for being patient. Powder coating … Thanks for the great information. 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