[nodott]

You might try etching the surface with phosphoric acid (milkstone remover), available at any farm supply and many other places), hydrochloric acid (muriatic acid) works also. Then prime with zinc chromate primer. Rather than let the paint dry hard, you might try engraving while it is still somewhat soft. That might help with the flaking.

That might be too long of a process and too costly but does it work better than just a self-etch primer?

Never thought about engraving while it soft could look into that.

[Jim Dawson]

That might be too long of a process and too costly but does it work better than just a self-etch primer?

Never thought about engraving while it soft could look into that.

It wouldn't take any longer than roughing with 150 grit and washing with acetone. Just wipe it on, it reacts almost instantly, and rinse with hot water. Allow to dry and paint. The zinc chromate primer makes a good bond with the aluminum.

[65patch]

Engraving powder coat works great.
I engrave fine line text for electronic enclosures. 6061 - t6 from Industrial metals.

Try better paint like a catalyzed auto paint.
You will need a compressor and sprayer though.

Lay it on as thin as possible.

[nodott]

Engraving powder coat works great.
I engrave fine line text for electronic enclosures. 6061 - t6 from Industrial metals.

Try better paint like a catalyzed auto paint.
You will need a compressor and sprayer though.

Lay it on as thin as possible.

I have a friend that is looking into getting automotive paint that will match the colors that I need. He has a spray booth and I will just pay him for the work. Other than that I have had some success by starting off first with lesser depth of cut and then going back and redo the engraving to the full depth of cut I need. Still willing to try and the automotive paint and see if there is some improvements.