I finally got around to finishing the engine cover off.
I bought a small paintbrush and a pot of silver paint from the local hobby store and told myself I would do all the lettering freehand, and I would not go outside the lines or stuff it up, because I did not want to repaint the whole thing again...
From this:
To this:
on both sides, by hand with no masking and just a brush and paint took me nearly 40 minutes, but it turned out fine with no problems
Looks pretty good now.