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Yes it is, my reservation is in line of after you complete the repair you will ultimately have two concrete sections with a medium bond then your going to add a third over the top of the two, all three will expand and contract at slightly different amounts this will put a huge strain of the top skim coat that will only be 1/8" thick and cover the entire 12" x 12' area.
I'd hate to see you add the skim coat only to see that one crack away.
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