I use Art's Belguin blue.....
My question is this. Since your can't card the space between the ribs and water gets in there, what do you do?

Sure it drains out through the weep hole. And yes you can dip bluing in the hole if you wish. And you can dry the barrels with with heat and inject oil there, but of these things seem to be insufficent in my mind, yet many people use Belgiun blue or other water blue. I remember the late Mr Thredwell prefered it.

What say you?

jerry