As with all binding agents which set hydraulically, losing moisture or drying out too quickly inhibits chemical reactions needed for it to set.
Cover whilst it is setting if the weather is hot, do not make mortar in direct sunlight or in freezing weather. It sets fairly quickly: in about ½ hour.
Only make up amounts that you can work with within this time-frame.
Avoid contact with rainwater which may be acidic and prevent the binding agent from working properly.
Avoid using warm water as it speeds up the setting process.
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