I don’t know if it might be available outside the US, but I’ve used Duracoat in flat black on stainless steel guns. I have found it virtually indestructible and have filled barrel flutes as well as engraving backgrounds. Once cured for a few weeks, it is resistant to chemicals and wear and would...
Thermoloc is great stuff! I use it on almost every project, especially odd shaped pieces such as pocket knives. I also use the GRS thermoloc vise jaw inserts. You can use it over and over.
A non-engraving comment on thermoloc. My wife had a damaged antique picture frame. I used thermoloc to...
I use an HP MFP M29w laser printer and have no problem transferring to metal with acetone. I use Q tips to swipe acetone across the back of the paper, then press down with a finger. It takes a little practice to learn how wet the paper needs to be, but it works fine for me. Good luck.