I didn't have stucco mix and didn't want to make an extra trip to Home Depot
so I patched a small area on my exterior stucco wall with mortar mix
instead. After a few days I rub my hand across on the patched area and the
mortar mix crumbles like dry dirt. Why is this stuff strong between bricks
and no good on stucco surface? It is possible for the cement migrated to the
bottom of the bag and all I had mixed was mostly sand?
Old material, "struck" in the bag. Still looks dry and powdery in the bag,
but the particles of portland cement have lost their chemical activity from
slow moisture intrusion over time.
If you want to use old cement products, test them first before committing
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