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Question on B&O M-26 roof color
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Scott H. Haycock
Attached is a chip for the current version of Sherwin-Williams Galvanized Paint.
It is gray not silver. I think it dries lighter than the gray galvanized color on old metal, which is also gray.
Scott Haycock
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Scott H. Haycock
That seems reasonable considering the war.
Scott Haycock
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Here's a shot that shows the galvanized (and unpainted?) roof of one of the CNW all steel box cars built in 1941 I think. It looks as if the longitudinal running board is unpainted but the short laterals may be painted ? On 9/23/2022 2:56 AM, Scott H. Haycock wrote:
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Tim O'Connor Sterling, Massachusetts |
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Philip Dove
How quickly did the "silver" paint lose it's lustre? Silver coloured Aluminum paints could be of varying qualities. Ones known has "high leafing" aluminum pigments stayed bright longer. I think the pigment was meant to be in microscopic flakes that overlapped. |
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Speaking of B&O box car roofs, I found this photo to be interesting. Notice that BOTH of the end panels have lost their paint, while none of the other panels has. I actually have seen this a number of times especially and post-STMFC freight cars. I suppose in the running board era that lateral (latitudinal) walks might have affected how the end panels weathered, but I've also seen it on cars that never had running boards. On 9/22/2022 11:54 PM, Bruce Griffin wrote: Charlie, --
Tim O'Connor Sterling, Massachusetts |
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Philip Dove
Ron is absolutely right in my opinion in saying cold galvanising paint is grey, not silver. My experience of selling industrial paintsin the UK during the '70s and 80s was that cold galvanising paint was mid grey when dry. |
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mopacfirst
This 'cold galvanizing', as it's sometimes referred to, is 97% zinc powder in in organic binder. One common brand is Galvacon, trademark of Lanco Paints.
If you look at something that's galvanized and has a weld in it, and gray-colored paint over the weld, that's it. Note that although 'you can't weld something that's galvanized', of course you can. You just have to grind off the zinc coating for a half-inch to an inch away from the weld lane, then paint over it with this stuff. Note that I have no experience with something large like a car roof being painted with it, but perhaps the shop couldn't easily get that much steel galvanized during wartime, but could buy the paint. Ron Merrick not a paint specialist |
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I agree with Bruce. Painted roof that has accumulated grime. To my eyes, it looks like matching paint under the running board.
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Scott H. Haycock
According to RPC 16, Sherwin Williams Galvanized Roof Paint was used by Pullman Standard on the CNW's emergency box cars that they built in 1943. These cars had Viking roofs, whereas the rest of the order, built by ACF, had unpainted galvanized Murphy straight panel roofs.
I found out about this paint while researching these specific CNW cars, so I don't know if this product was used elsewhere.
I looked up 'galvanized paint' and it seems it is comprised of zinc powder, binders, etc. The process of applying it is sometimes referred to as Cold Galvanizing. Apparently this stuff was invented to repair the worn or missing galvanized coating on metal surfaces, so it seems reasonable that it would find uses in rebuilding, repainting, and other repair work. But I don't know of any evidence. Possibly shop records might show its use, but that's another research project!
Scott Haycock
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Charlie,
I’ve never seen any reference to silver, grey, or a galvanized paint anytime during the 50s or before. Exceptions do occur, but the B&O seemed to cover things with car cement for water or rust proofing. Silver roof paint did appear on some MOW and company cars in the 60s, but haven’t seen it on boxcars. Bruce D. Griffin
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Charlie,
My bet would be dirt over B&O freight car paint for that roof. Note the roof under the longitudinal running board. And btw, this is one of the arguments for "getting it right" with respect to the color, as there are areas of a car that can be sheltered from
dirt or fading and pretty much retain the original color 😉
Regards,
Bruce
Bruce Smith
Auburn, AL
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> on behalf of Charlie Duckworth via groups.io <Worth51@...>
Sent: Tuesday, September 20, 2022 8:00 PM To: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> Subject: [EXT] [RealSTMFC] Question on B&O M-26 roof color
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