>What I'd like to do is leave the concrete plug in place when I slop the repair
>concrete around the broken area. This will allow me to properly shape the part
>of the tapered hole that has broken out. The problem of course is that the
>repair concrete will most likely seal in the plug where it comes in contact
>with it. What can I put on the edge of this plug that will allow me to form
>the concrete properly but will not allow the new concrete to bond with the
>plug? Maybe some axle bearing grease or something? I suppose I could make a
There are concrete mold release agents. I suspect there's one that
is suitable for use on concrete.
David
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