Engine paint

[smsw]

Has anyone had any experience with CO2 (dry ice), blasting...?

It does not sound like dry ice blasting will do what you want.  From this article, I read that it will not harm paint, unless it is loose and flaking.  In fact, it seems to be the weapon of choice to remove old dirt, scale, corrosion, etc. without harming an old painted surface.

https://www.hagerty.com/media/maintenance-and-tech/dry-ice-cleaning-the-coolest-way-to-remove-rust-grime-and-undercoating/

[Huzo]

It does not sound like dry ice blasting will do what you want.  From this article, I read that it will not harm paint, unless it is loose and flaking.  In fact, it seems to be the weapon of choice to remove old dirt, scale, corrosion, etc. without harming an old painted surface.

https://www.hagerty.com/media/maintenance-and-tech/dry-ice-cleaning-the-coolest-way-to-remove-rust-grime-and-undercoating/

That’s rather telling isn’t it ?