What is the secret to getting Combine Path to work?

I am following along with the Dungeon Designer tutorial from the Tomb of Mapping

When I get to the part where I need to join the dungeon walls to make them seamless using Combine Path is just seemed to flake out on my most times. Getting the odd stray lines or white out of one of the pieces. Clicking "F" or "S" just moves the problem around.

Is there some kind of better guide for this function?
Should I join two entries and then right click or try to do the whole map section as one long command repeated command?
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