Be sure that you know the proper setup before you glue the product together. You can stack a few pieces together before actually gluing them to make sure they are placed correctly. Glue as you assemble. Be careful not to damage the outer edge. O-Rings will chip along the widest edge.
Special care needs to be taken while stacking.
Use at least enough Sikaflex to go completely around the top or bottom surface of the O-Ring or product. For planter bases, you can leave a one-inch gap in the Sikaflex for drainage if desired. Let the Sikaflex 1A set up until it is thick, but tacky, before putting the pieces together. This will allow you to be able to level the product as you are building it. Sikaflex takes 24 hours to cure.