Repaint / touch up engines

I can't see any colour name or code in your photo.
Can you (or anyone else of course) be more specific?
I'm assuming you are talking of white engines, which is what I am interested in.
MAN also used blue and grey in the past, but AFAIK only for some commercial engines.

Many thanks, good to know.
My understanding is that MAN ship the engines to their distributors and/or builders already painted.
So, I don't think the white is different in those installed by RDI (or any other dealer for that matter) vs. those installed elsewhere.

I did an engine room detail for a captain friend, one time. The guy is notoriously OCD, so performing to desired quality was a challenge. After getting the engine room bilges sparkling and shining using the whole Alumaprep line of products to his spec and methods, I moved on to engine paint. The motorsailor had a pair of Yanmars in it that weren't a stock green, but some custom hue. I took the oil filler cap from the engine and went to the local Sherwin-Williams automotive paint jobber, and found that they could easily match it with a computer spectrograph (that was new, then). When I was talking to the guy, I wondered if it could be put in spray cans. Turned out that wasn't a problem if I bought six!
So, off I went with a six pack of rattle cans in an ugly green color and went to work. I learned a lot about masking, especially the difference between just enough and overkill. I found that a piece of cardboard held in one hand at just the right place at hose ends and clamps did almost as good a job as crazy amounts of blue tape and fine-line tape. I just had a can of Xylol with plenty of rags and Q-tips to detail misses and overspray.
Captain OCD was completely satisfied, a thing that a few by-standers didn't think possible
Two years later, he asked me for a repeat engagement, but I was fortunately in a position to decline.
Over the years, I've kept a rattle can of engine paint and a piece of cardboard close to hand during voyages. I often will clean an area with soap and water on the running engines underway during an engine room check, and then shoot paint on it at the next engine room check. A great way to keep on top of the job and not have to take too many fume and vapor precautions.