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Size. 20kg. Setting Time. 5-10 Minutes. Works on. Wooden, metal or concrete posts. Delivery. 1-5 Working Days. Fencemate postcrete comes in 20kg showerproof, tear resistant, recyclable plastic bags. Fill 1/3 of the hole with water and pour in the fencemate into hole with post in place. Once filled setting time with water should be around 5-10 minutes.. Allows fence panel hanging in 30 minutes.