what does that have to do with weed?
At first thought, the particle board is a mixture of wood particles (duh) and glue. I'm guessing the moisture wets the glue, swells the wood, and sets the bumps when the glue dries again... maybe... IDFK. In that case, it would have to get wet and be allowed to dry in a press squeezing it flat.
That's my guess and I'm sticking to it.
At first thought, the particle board is a mixture of wood particles (duh) and glue. I'm guessing the moisture wets the glue, swells the wood, and sets the bumps when the glue dries again... maybe... IDFK. In that case, it would have to get wet and be allowed to dry in a press squeezing it flat.
That's my guess and I'm sticking to it.