Swaging questions

[arenyi]

I thought that I asked a simple question, but I see, even Brion doesn't have a simple answer.
I sliced my old swages (around eight years old) to learn what happened inside.
In the first slice, around 4 mm from the top the wires were very rusty. There is no doubt that it is the time to replaceÖ..
In the second slice, around 8 mm from the top, the metal was clear; however three rust dots were seen in the space between the wires. Is it "local" rust, or just dirty water that penetrated from the upper parts? I don't know. Anyhow, it is evident that internal sealant would eliminate this by filling the space between the wires.
The third slice, around 15 mm from the top, was absolutely clear.
Since the wires always break near the open end of the swage, I am not sure if the internal sealant can -for long term- really seal the open end of the swage and if water can penetrate under the seal, the situation may deteriorate.
I asked two local riggers and ñnaturally- both replied that they are "working exactly according the manufacturer's instructions, and they don't require any sealing".
It may be very interesting to see professional cutting of old swages, microscope photos and explanation of an expert in metallurgy. Maybe this was done by one of the swaging machine manufacturers?