sproulman - the very hot water could very well indeed attribute to the flash rust that you noted. In my case though it was just the opposite. I actually put a tea kettle on, clean the barrel in very hot water, and when I hear it whistle, I take the barrel outside, lean it against the railing, put on my gloves and rinse the barrel with the whole kettle.

After that I take the barrel in and normally the second clean patch is dry for me. The barrel on the other hand is scalding hot and would actually burn me. Once I know the barrel is dry, a simple patch with Sheath and the barrel is then allowed to cool.

Do you think that the hot barrel draws that Sheath into the pores? When I get ready to shoot the next time, I dry patch the barrel and never get rust or even Sheath for that matter.