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The theory goes that you can't actually seal a tube, there will always be micro holes somewhere to allow moisture, not water in.
But it's very difficult to seal a tube with brazing. There is a huge amount of heat that goes into the tube, the air inside the tube is heated and expands and consequently pushes outward so as you apply liquid brass to cover joints or holes, it tends to blow small holes in it
PhilDAS
@jontea
Just to clarify, he does have breather holes in the tubes whilst brazing, then once it's all brazed he fills em with brass.
Obviously I'm not a frame builder, and this is a genuine question, how does water get in a sealed tube?
Sorry for derailing with non Geekhouse matters, bikes looking splendid.