Treating plywood lining

[Bibcamper]

Hi,

I'm currently converting into a camper, putting plywood on the walls, floor and ceiling.
Do I need to treat or seal this plywood in any way before carpet lining to prevent moisture/mould?
Would Beeswax do the trick?

Thanks

[bortaf]

i wouldnt wax it if at any time later you want to glue carpet on ?

[dumper]

I’ve always used marine ply glued carpet on it for insulation I’ve waxoiled the van panels and used the recycled plastic bottle insulation and never used vapour barrier I use my van all year round marshalling on car rallies and never had a damp problem I’m now on my 7th van .