My signs are made of MDO plywood which is a plywood that is made with hardwood and waterproof glue. All elements are glued with a waterproof glue and nailed to ensure a solid connection. The paint is a high quality exterior paint which will last for years.
This sign was for a covered walk-way over their door.
This sign was outside above the door of a store.
The use of different thicknesses of wood provides greater depth.