Step 7: Re-laminate wood
Working one hand at a time, apply a thin layer of wood glue between each sheet of plywood and relaminate each hand. After glue is applied drape each hand over bowls, bind glued hand cut-outs to bowls using masking tape. This is a good time to make any refinements to the bowl shape, once glue dries the final bowl shape will be set.
Smooth bottomed bowls were not necessary at this stage like they were for the steaming phase, as the wood is dry and won't retain most indentations, just the curve shape.
Let glue cure overnight.
When dry use a utility knife and sandpaper to remove any glue burrs and smooth out and rough edges. When sanding start with a coarse grit (75-150) and work your way up to a finer grit (250+), cleaning between each sandpaper sheet with a dry brush. Consider 3-4 sheets of sandpaper: 100, 150, 200, 250 grit should suffice.