A slurry is a mixture of cement powder and water (sometimes with glue or other admixtures also) which is mixed to the consistency of something like cake batter or warm butter. With a slurry paste, you can paint the inside of your mold before you cast your concrete or mortar. The slurry adds a layer of fine detail because of how dense the cement is. You do not want your slurry layer to be thick but more like a skim or skin coating. Once you have painted your slurry in place, it is very important to add your concrete into the mold before the slurry begins to dry.

If the slurry dries before you add your concrete to the mold, reapply another wet layer of slurry and then add your concrete. You should still vibrate the mold but the addition of a slurry layer should help to minimize or even prevent honeycombing or voids left in the concrete.

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