On Apr 20, 11:44 am, wrote:
Hi,
I need to plant two
posts into concrete,

Are you sure they "need" concrete...?

I might use concrete for some reason, I just can't think of one. A
post has to rot, eventually, then there's just a big hunk of concrete
to be frost heaved or a complete PITA when the post needs substitution
or removal.

But I'm no fence expert, just a former farm boy.
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- gpsman