On Tue, 10 Aug 2010 21:42:44 -0400, Bill wrote:

The dry 90 minute compound, 3/8 caulking backer and glass mesh tape.
That is what I would do, hope that helps.

Mark

I am obviously not a professional. I'm sorry, I can only guess what you
mean by "3/8 caulking backer". Maybe you could you break it down into
steps?

I am not a pro, foam backer comes in different diameters. But the
Durabond 90 would probably be enough.

Mark