It's best to start at the top and work down, section by section. Wipe off any drips that appear as soon as possible. Let the primer dry according to the directions.
Inspect the surface carefully to make sure it's completely coated with primer. Read the directions on the container of metal paint. Apply the metal paint -- which should be the same brand as the primer -- according to the product directions. Let the paint dry according to the directions.
Inspect the surface carefully to make sure it's completely coated with the paint [source: Do It Yourself ]. Once the galvanized metal is cleaned thoroughly, most acrylic paints will adhere to it without any issues. What is the best primer for galvanized metal? Use a rust-preventing primer for improved corrosion resistance and to ensure the paint adheres to the metal. There are a number of options, but many people like Rust-Oleum Galvinoleum Primer, which comes in a spray can for easy application.
The secret weapon of the galvanized steel painting process is: white vinegar. Yes, you read that right! Like most, you probably already have white vinegar on hand as a cleaning solution for your home.
White vinegar is effective and non-toxic which is much safer to use rather than an industrial solvent. All you need to do is apply the vinegar on a clean rag and then simply wipe down the galvanized surface.
The great thing about vinegar is that it has an acidity that will react with the metal, promoting pain adhesion.
This gives the primer and topcoat a suitable profile to adhere to. This will help to provide a profile for the paint to adhere to. After salt neutralisation by the T Wash, you should apply an initial priming coat. An alternative to this 2 pack material is the Teamac Micaceous Oxide MIO , which also benefits from being anti-corrosive. For areas with low traffic such as corrugated metal roofing where the metal profile sheets are susceptible to flexing due to wind and sunlight expansion, we would suggest an elastomeric coating such as Rust-Oleum Noxyde.
Use Rust-Oleum Noxyde Peganox for more detailed brushwork as required on smaller areas. Both these coatings are available in a fast range of colours in either a gloss finish or satin finish. For more areas subject to harsh conditions such as offshore marine structures, Promain would recommend Sigmashield at microns DFT.
Withstanding high levels of weather abrasion, Sigmashield can continue to protect metal even when fully immersed in water. In conclusion, galvanised steel coatings will eventually deteriorate after time. When it comes to specifying or researching suitable products for your project, we recommend discussing your requirements with our technical team. To discuss your individual requirements, please call Promain on Ask our Technical team a question by using the form below or call the advice line on Although the zinc coating of newly galvanized steel may look clean and ready for paint or powder application, the surface is actually quite smooth and requires cleaning and profiling to create a good mechanical bond.
If the galvanized steel is partially weathered, i. The surface must be cleaned of contaminants and then profiled by sweep blasting, wash primer, or acrylic pretreatment. If the galvanized coating is fully weathered it is usually matte gray in color due to the formation of a zinc carbonate film on the surface.
This film is tightly bound to the galvanized surface, has a fairly rough profile, and generally requires only cleaning to be suitable for paint or powder application. If the galvanized coating is not clean and have a good profile, peeling and flaking of the paint or powder may occur. Regardless of the age of the galvanized coating and the cleaning and profiling steps taken, the surface must be completely dry before application of paint or powder should be considered.
Particularly for powder coatings , if the galvanized surface is not dry and powder is applied on top, the moisture will react with the zinc to form zinc oxide. During the curing process of the powder coating, moisture trapped in the zinc oxide may expand and be released called outgassing , causing pimples or blisters in the powder coating.
Most reputable paint manufacturers have paints uniquely designed for application over galvanized coatings. The material provided herein has been developed to provide accurate and authoritative information about after-fabrication hot-dip galvanized steel.
0コメント