Quote Originally Posted by GWBowman View Post
I was thinking of doing this to raise the bottom of a few pipes to the airway. I'm curious about cleaning. Will doing a salt/alcohol treatment or using a pipe retort ruin the pipe mud?
Good question George.

I doubt that the salt bath would affect the mud but the retort can affect it. I've had estates where mud plugs came loose during a retort.

I'd do either, salt or retort, before the application of any pipe mud. You want the area to be worked to be clean and the mud will adhere better.

When you're lifting the bottom level of a pipe with mud use care that you don't block the draught hole or create a groove that will defeat the purpose.