How to Make a Concrete Planter 7 Steps with Pictures
Make a box out of them as shown in the picture using 4cm screws. Seal the edges of the box using some scotch tape. Mold: Take the big box and the inside mold and lay them on the floor as shown in the picture. Put the inside mold upside down on top of the big box. Make sure to align all the edges and then secure them both with 4cm screws.