I would state in your contract that you can not warranty any laminate over a plywood substrate.
Boats cabinets laminated playwood.
When a laminate sheet is glued to its surface it becomes a laminated plywood the laminate sheet serves both decorative and protective functions for the plywood.
Tricel honeycomb panels are as strong as plywood for bulk heads cabinetry and furniture.
Plywood is used for a plethora of interior exterior and structural applications.
If the plywood is required structurally then this becomes a messy problem indeed.
The more veneers that are used the stronger and stiffer the plywood becomes so for bending fewer is better.
It is the water resistance of the type of glue used to laminate the piles which determines the grade of the ply as well as wood of the veneers.
Given sufficient time and use it may be that the protective fibreglass layer becomes damaged allowing water to permeate the surface and begin to rot the underlying plywood.
At fisheries supply we carry a variety of marine construction boards from trusted brands like coosa composites king starboard taco and more so shop now for all your boat.
The main issue with using a non marine plywood is the eternal problem of time.
Plywood is normally sold in rectangular sheets of 4ft by 8ft 1220mm x 2440mm.
Mdf is the way to go.
But tricel honeycomb panels can weigh up to 80 less than plywood which means you can design and build the luxury customers expect while giving them the economic benefits and operating performance they demand.