I could never got the mix right, so when the cracks were dry, I cleaned them out the best I could and ADDED EXTERIOR LIGHT GREY SILICONE CAULK which lasted ten years and helped the slabs to level out again. This is only for up to 1/2" cracks, of course. You gotta get the cracks before they get too big and ruin the whole slab. Takes a little longer, but worked for us.
check with the experts at Lowes or Home depot. They can recommend a concrete product that you can use. All the Quick crete products are excellent but I would ask the experts for suggestions.
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