Is it really a 2011, or is that a typo?
To me, whenever you find particle board crumbling, it's time for work (or the trash).
The first question is, "Is the leak fixed?" Until the leak is fixed, anything else is a waste of time.
Once the leak is fixed, my method of fixing particle board is to replace it with real plywood. Real plywood is stronger, less susceptible to water damage, and lighter. Depending on inclination and situation, I either replace the whole cabinet structure with plywood and any necessary lumber framing, or splice in the plywood where the particle board is damaged.
For the latter case, 1/2" plywood usually works well for splice plates. Don't screw into particle board or the end grain of plywood - it won't hold long term. Screw into the plywood (or bolt); I like to add glue if I don't plan on taking the structure apart again.
You can glue veneer onto the plywood just as easily as onto particle board.
Probably not what you wanted to hear, but I find redoing things the right way makes me a happier camper.
Fred W
2019 Flagstaff T21TBHW A-frame
2008 Hyundai Entourage minivan
camping Colorado and adjacent states one weekend at a time
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