full colour moodlamp on a concrete base

Step 2 Pouring the concrete

Mix the concrete according to your bag's instructions. I didn't use gravel, just sand and cement. Pour a little at a time and then agitate with a stick.

After pouring all the concrete, knock out the air bubbles with gentle hammer taps on the outside of the mould. I also tried vibrating the mould with an electric sander - but didn't notice much more bubbles appearing.

This step is important because otherwise the bubbles could make the finished piece look bad, or if a bubble was in an important place it could cause problems with mounting the plates.