I just picked up a 2J in fairly decent shape, and was in the process of cleaning and sanding in prep for a fresh coat of "Ubiquitous Gray" machinery paint. The base of the machine had lots of chips in the paint, and I picked up some paint stripper, figuring that would be the easy way to go. What I found was, underneath a couple "extra" coats of gray, on top of the factory gray, was a black base color of some sort. Of course, the paint stripper took that off as well, and what I was left with was a bare casting, grinding marks and all. I used to work in a casting foundry, and recognize those grindings as part of the process involved with cleaning and deburring castings. It appears the factory used some sort of heavy primer to fill in all the grinding/deburring operations on the castings. If I simply paint over the bare surface, even with primer, those marks are going to show through. I know this isn't a '57 Chevy I'm restoring, but I would like to get it as clean and good looking as I can...Any clues as to whether or not the factory was using a heavy fill/primer to clean these things up before the final gray coat of paint was applied..? I can always hit it with multiple coats of primer and sanding, but I had hoped this would not be a major task.....