First of all, you need to cover the buckets with a mesh. Next, apply a solution 1:2, wait about two days. This is necessary for the cement to harden. Small stones can be glued to tile glue (in the video Ceresit cm-17). The next day, the cement without sand must be diluted to a creamy state and add color (color for paints is also suitable), cover up the seams between the stones. After drying, coat with acrylic varnish in 2 layers.