Self-leveling concrete generally does not crack easily if it is installed correctly over a properly primed, rigid, and stable subfloor with accurate water mixing ratios. However, cracking can occur if the compound is mixed with too much water, which weakens its tensile strength and increases shrinkage during the curing process. Cracks may also form if the underlying subfloor flexes excessively under weight, if expansion joints are ignored across large open floor spans, or if the material dries out too rapidly due to drafts, direct sunlight, or a missing primer layer that caused the substrate to suck moisture out too fast.
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