Having a flawless painting job is extremely satisfying. Aside from using high quality paints and having the right painting technique, the credit ultimately goes to proper surface preparation. We’re on the last leg of our surface preparation series,  and we’re tackling how to prepare new metal surfaces.

Identify the type of the metal surface

What type of metal are you going to paint? Are you painting on galvanized iron sheets (yero), aluminum, or stainless steel? Each type of metal needs a specific preparation.

Reminder: The type of metal you’ll use for your home should be considered based on your location. If you’re living near the sea, volcano, or a chemical factory, it’s best to use galvanized iron or stainless steel for your home to lessen the risk of rust.

New galvanized iron sheets (G. I. Sheets or Yero)

Wipe the surface with a rag soaked in paint thinner to eliminate grease, oil, wax, or other contaminants. Then, prepare an etching solution. Carefully and slowly pour one (1) part Boysen Metal Etching Solution B-71 into nine (9) parts water.  Never add water to acid. Spread the etching solution on the surface and let it sit for 10-15 minutes. Rinse with water and dry right away. You must apply the primer promptly after drying to avoid rust from forming.

You don’t need to etch the surface: if the G.I. sheets have been exposed for 6 months or more, or if you use Boysen Primeguard as your primer.

Follow this link to get topcoat paint recommendation.

New aluminum or stainless steel

Use a clean dry rag to make sure that the surface is clean and dry. Then, apply Boysen Primeguard at once.

Follow this link to get topcoat paint recommendation.

Rusty and unpainted metal surfaces


Check for rust and treat it before painting. You can remove rust using a steel brush or a rough sanding paper. If there’s still stubborn rust even after sanding, you should apply pure Boysen Metal Etching Solution B-71 on rusty areas. Let it stand for 10-15 minutes. Then, wash it off and dry it. Apply primer straight away to prevent rust from forming again. Use our Choose Your Paint tool so you can get topcoat paint recommendation that suits your painting needs.

Watch Boysen Painting 101 to know more about how to prepare other surfaces.

If you have any technical questions or clarifications, send us an email at ask@myboysen.com or call this number (02) 363-9738 local 417 to 418 during office hours and talk to our Technical Team.



Yasmin Aguila is a copywriter at Boysen Paints Philippines. Interested in making paints fun and relatable, she produces quizzes and painting ideas for this blog. She claims that she is obsessed with yellow, but she always dresses in black from head to toe.

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