pjm20
Junior Member
Posts: 58
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Post by pjm20 on Apr 18, 2024 4:56:44 GMT -8
All, I have Walthers Mainline SW7 that I have been stripping to detail and paint. I put the actually metal chassis in some 91% Isopropel to strip the paint off of the frame itself. In the below image you can see how the chassis was attacked:  Anyone have any ideas? I haven't seen this as a problem before I and it is quite perplexing that is partially attacked the frame. The surface layers of metal came off like paint, which is why I didn't initially catch it. This frame is shot, but I am curious to hear if anyone has another experience with this or this frame just didn't have the right mix of pot metal that didn't form right. |
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Post by onequiknova on Apr 18, 2024 5:09:12 GMT -8
Oh wow. I've stripped plenty of shells in IPA, but I don't recall every needing to strip a chassis before. I'll definitely keep this in mind.
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pjm20
Junior Member
Posts: 58
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Post by pjm20 on Apr 18, 2024 5:28:28 GMT -8
Oh wow. I've stripped plenty of shells in IPA, but I don't recall every needing to strip a chassis before. I'll definitely keep this in mind. The SW7 had some paint on the side sill with a stripe decal (UP) along with the switcher steps I didn't feel the need to unglue and strip separately. |
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Post by edwardsutorik on Apr 18, 2024 5:38:12 GMT -8
I don't think alcohol will react to the metals that are in the alloy.
The term "surface layers of metal" makes me think there was a failure in the casting process. Somehow, the mold was partially filled, and then it was completed with another injection. This created a "non-bond" between the two layers. And the outer layer "came off like paint".
Theory only, as I never heard of such a thing.
It'll be interesting if it's happened to others. It should be strikingly rare.
Ed
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Post by kentuckysouthernrwy on Apr 18, 2024 7:56:12 GMT -8
What’s rare in my experience is stripping the metal chassis.
I’ve stripped and painted dozens of locomotives but can’t remember ever stripping the entire framework of any of them.
This sure is a depressing development.
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pjm20
Junior Member
Posts: 58
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Post by pjm20 on Apr 18, 2024 10:22:21 GMT -8
The Mainline chassis has the deck integral to the frame, not the shell, hence it needing to be stripped. This isn't a knock on Walthers at all, I believe the Mainline locomotives are great, just curious to see if anyone else has had any issues. I have a few more SW7s/NW2s to strip, so I'd rather ask first than experiment.
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Post by kentuckysouthernrwy on Apr 18, 2024 13:30:47 GMT -8
The Mainline chassis has the deck integral to the frame, not the shell, hence it needing to be stripped. This isn't a knock on Walthers at all, I believe the Mainline locomotives are great, just curious to see if anyone else has had any issues. I have a few more SW7s/NW2s to strip, so I'd rather ask first than experiment. You might consider some sort of abrasive blast. baking soda or air eraser material. I'd expect, tho, with similar defects in the metal, similar results might occur just from different mechanism. Best of luck, that surely is disappointing to say the least. |
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Post by thb401 on Apr 18, 2024 14:56:17 GMT -8
Back in the day I always bead blasted my custom painted PRR Atlas S1-S4 and GP7 frames. Low pressure, wash and Floquil mix of DGLE.
Sorry about your SW7....Bill
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