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Basically I want to engrave letters and some symbols on aluminium box and fill them in using a paint, What paint should I use?

As far as I know aluminium usually gets painted by anodazing process. But still, I believe there must be a way to paint engraved stuff.

This is the box I want to engrave stuff on: enter image description here

Example of the work: enter image description here

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For best results you need a etching type paint for aluminum or a Zink oxide primer then any paint. Aluminum oxidizes with air so it needs a primer or a paint designed for aluminum that actually etches so it bonds with the metal. Annodizing is used to protect the surface it is a plating type of solution in a bath so it is a bit different (and the surface is usually harder than aluminum.

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