5 – Then you have to paint an exterior sealer to protect the wood.
6- Spray the bottom of the upside down trash cans with a spray sealer to
prevent rust from collecting water in the now bottom channel of the trash
can.
7- Drill a small hole in the middle of the upside down trash can to attach the table round
8- Do the same on the wood rounds before painting them. Just a pre-drill for
the screws.
9- Once the paint and sealer are dry you can screw the table top to the mesh
trash can and tighten a nut over the screw.
You can see full details here: Credit