Can an overlay crack or delaminate?

It can if it’s installed over an unsound surface.

Overlay materials are polymer modified and are designed to go down thin and still remain strong and wear-resistant. However, overlays are only as good as the subbase they are applied to. They are not intended to fix bad concrete.

If you put an overlay directly over a cracked surface the overlay is likely to crack as well.

Delamination is caused by excessive moisture rising up through the subbase.  A good contractor will test for excessive moisture vapor transmission and apply some type of a membrane between the existing surface and overlay if needed.

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