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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