In order to have a long-lasting paint job on galvanised steel, you should prepare the surface properly. If the preparation is good, it should last for many years.
When the paint on galvanised steel failed, it's not the paint. It is because of the failure to perform sufficient preparation. Here is how to redo the job the right way:
First, wash the surface of the steel with a mild acid. Since the process of galvanisation leaves a smooth and oily film on the finished steel, paint does not hold very well. Applying acid etches on the metal provides the surface "teeth" for the paint to stay in place. You can use simply use plain white vinegar.
To repaint the surface of the galvanised steel, perform a thorough prep job. Scrape off all of the peeling paint and the feather the edges using a 150-grit sandpaper. This is to blend the old coat of paint into the new. Sand the rest of the surface to make the old paint rough.
Then quickly wide the bare metal with plain white vinegar. This prep job requires only little of your time and costs almost nothing but keeps the paint from peeling again. Paint the surface with primer intended for metal, and finally, paint it with the colour of your choice. Acrylic latex is a good choice, but any paint of high quality should do, with the right preparation.
For rust-proof steel products, such as quality galvanised cable drums, electrical lead stands, etc. visit TCG Industries at the following links:
www.tcgindustries.com.au/products/cable-drum-frames
http://www.tcgindustries.com.au
When the paint on galvanised steel failed, it's not the paint. It is because of the failure to perform sufficient preparation. Here is how to redo the job the right way:
First, wash the surface of the steel with a mild acid. Since the process of galvanisation leaves a smooth and oily film on the finished steel, paint does not hold very well. Applying acid etches on the metal provides the surface "teeth" for the paint to stay in place. You can use simply use plain white vinegar.
To repaint the surface of the galvanised steel, perform a thorough prep job. Scrape off all of the peeling paint and the feather the edges using a 150-grit sandpaper. This is to blend the old coat of paint into the new. Sand the rest of the surface to make the old paint rough.
Then quickly wide the bare metal with plain white vinegar. This prep job requires only little of your time and costs almost nothing but keeps the paint from peeling again. Paint the surface with primer intended for metal, and finally, paint it with the colour of your choice. Acrylic latex is a good choice, but any paint of high quality should do, with the right preparation.
For rust-proof steel products, such as quality galvanised cable drums, electrical lead stands, etc. visit TCG Industries at the following links:
www.tcgindustries.com.au/products/cable-drum-frames
http://www.tcgindustries.com.au