Slightly moisten the parts that need to be glued with a damp cloth. Bison PU Max® Wood Adhesive hardens through a chemical reaction with water.
Apply sufficient ammounts of adhesive on each individual part of the flower box.
Assemble the flower box. Leave to dry for 4 hours. Use glue clamps. Screws may be useful to keep difficult joints together until the glue is dry.
Before sandpapering the flower box, remove any adhesive remnants with a chisel or a break-off knife.
Sandpaper the flower box.
Finish the flowerbox with paint or stain and fix it against the fence.