Bare aluminum is similar to vinyl, fiberglass and plastic in that it requires abrasion before any paint will adhere to it. Follow up by wiping it down with mineral spirits. Anodizing is the best possible surface for paint adhesion. by welder » Tue Apr 03, 2012 12:47 pm, Post It doesn't matter what you do to get the surface bare, chemically or mechanically, because it immediately begins to reform oxide to protect itself. Cleans & etches in one operation. The more I read into it the more it makes sense. You need to use self-etching primer to paint aluminum, but prep work is especially important. It is often still recommended by experts to sand the metal before (and after!) the primer to ensure the best adhesion to the next coat of paint. In DPLF epoxy primer for instance, as you point out the "normal" etch primer DPX170 and 171 are not to be used, however, the "wash" etch primer DX1791 is recommended and in fact bare metal "must" be treated with a metal conditioner or the DX1791. How To: Paint Aluminum Siding Breathe new life into your aluminum siding by repairing, cleaning, and painting it. by Sculpin » Tue Apr 17, 2012 7:14 pm, Post It doesn't seem to be a common practice over here although it makes sense if the metal is better off for it. An example of the application order on bare metal is: 1) bodywork including filler/bondo 2) paint prep solvent 3) self-etch primer 4) high-build primer 5) basecoat 6) clearcoat. by goatram » Tue Apr 03, 2012 8:04 pm, Post It’s a paint intended as an undercoat that prepares numer… Beside this, should I sand self etching primer before painting? The shelf life of a can of this paint is officially 2 years according to the paint store. by johncar » Fri Apr 27, 2012 6:02 pm, Post Painting without primer deprives your project of a smooth and seamless finish. Follow up by wiping it down with mineral spirits. Post Wir und unsere Partner nutzen Cookies und ähnliche Technik, um Daten auf Ihrem Gerät zu speichern und/oder darauf zuzugreifen, für folgende Zwecke: um personalisierte Werbung und Inhalte zu zeigen, zur Messung von Anzeigen und Inhalten, um mehr über die Zielgruppe zu erfahren sowie für die Entwicklung von Produkten. johncar, sorry to have missed this post, I don't. STEP 2: Sand the metal surface in a two-stage process. The cost is the second factor, a full paint job sure does add to the cost of an new welded aluminum boat. Ensure that the surface you intend to paint is clean and free from dirt, grease, oil, or anything else … An acid-etch primer takes only a few minutes to apply and is ready to rinse within 10 … The first step in painting metal is to thoroughly clean it. You can etch stainless steel, mild steel, or high-carbon steel. After sanding, use a blow gun to remove any dust and then wipe down the aluminum again with PRE. They make a wash to do it or get an etch primer. Thanks again for such a great explanation Kevin. 4: apply aluminum metal treat to any bare areas. Follow the instructions on the bottle. Sie können Ihre Einstellungen jederzeit ändern. So if I'm reading this correctly acid washing to remove mill scale is a good thing even if the boat is being left unpainted. sculpin, I don't have any contact with the name shops, as I'm not in their class just a skiff builder, but I do know the results I've seen in the last four decades working on alloy boats. Do not mix this product with any other chemicals. When I was working on full size aircraft, we used to chemical etch the aluminum before painting. welder, goatram, I would add to my (novel length?) So neutralizing (using a base to counter the ph until neutral) them is not important. by johncar » Sun Apr 29, 2012 7:08 am, Post Just wondering here about home builds and repairs, do you guys acid wash your alloy to remove the mill scale and if not do you see any white patches appearing after the build or repair and if I choose to acid wash what solution should I use. To paint aluminum you need to etch it to give the paint someting to hold on to. Self etching primer contains a mild acid that actually etches the bare metal to create a superior bond between the primer and the metal. A few shiny streaks down the sides where water hits the welds under the deck line and dribbles down. Für nähere Informationen zur Nutzung Ihrer Daten lesen Sie bitte unsere Datenschutzerklärung und Cookie-Richtlinie. I have seen several skiffs from different Puget Sound builders, I think one was Workboats Northwest? Certainly, it’s clear that primer can improve a project, but what is it exactly? The key to getting paint to stick well to bare metal is all in the metal prep and using the right primers. You are a great member to have on board this site. Unlike wood, which is porous, these other surfaces are unable to soak up the adhesives within paint, and they will eventually shed their … Painting aluminum requires a few key steps in order to create a long-lasting masterpiece. The DX1791 is basically the 2K "modern" etch … Damit Verizon Media und unsere Partner Ihre personenbezogenen Daten verarbeiten können, wählen Sie bitte 'Ich stimme zu.' https://bodyshopforum.com/how-to-use-self-etching-primer-for-aluminum You tried to correct me on BD a couple of weeks ago Les. If you don't prep the aluminum well, the primer scratches off rather easily. You don't even have to power wash it, just drop it back in the water and all growth is gone. (b) the chemicals in this primer (and all metal primers) are NASTY. Follow the instructions on the bottle. by Sculpin » Sun Apr 29, 2012 8:26 pm, Post by jrogers » Tue Apr 17, 2012 1:13 pm, Post Etching the surfaces provides the tooth necessary for primers and finishes to adhere. Not trying to start anything just looking for info. In DPLF epoxy primer for instance, as you point out the "normal" etch primer DPX170 and 171 are not to be used, however, the "wash" etch primer DX1791 is recommended and in fact bare metal "must" be treated with a metal conditioner or the DX1791. Etching Primer. Aluminum is especially difficult to paint. and it. Removes rust, oil, grease, and dirt. by kmorin » Tue Apr 17, 2012 6:02 pm, Post Allow the floor to dry completely before painting, waiting a couple of days if necessary. The acid solution is corrosive to aluminum and painted metal. The DX1791 is basically the 2K "modern" etch … Step 1 Mix together a solution of equal parts water and vinegar.Coat the aluminum in the vinegar mixture and monitor it regularly, applying more vinegar solution if it begins to dry. It's a big project, but a DIYer with a true "can"-do attitude can tackle it. File away any burrs on the side of the steel you plan to etch with acid. by Sculpin » Fri Apr 27, 2012 9:39 pm, Post Maybe it is unique to our cold waters, but I just pull the boat a couple of times a year and spray bleach on it. Surely no longer hazardous. The etching creates a rougher surface for the topcoat to cling to, much like sanding would accomplish. Custom Shop Premium Self Etching Acid Etch Primer, 1 Quart - Ready to Spray Paint, Excellent Adhesion to Bare Metal, Steel, Aluminum, Fiberglass - Use on Automotive Car … Recommendations If your metal surface is mostly smooth, you don’t have areas with rust problems and you don’t plan on having to use additional filler or bondo, then self-etch is a great option. This step can be done by hand but for the best results a DA Sander should be used. aus oder wählen Sie 'Einstellungen verwalten', um weitere Informationen zu erhalten und eine Auswahl zu treffen. STEP 3: Apply self-etching … The acid in the vinegar will act to etch the metal and help the paint adhere. 4: apply aluminum metal treat to any bare areas. 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