irecently have had a new kitchen fitted. the worksurfaces are corian mounted on mdf. We have put some of the same surfaces outside (under a canopy). To be fair to the installer they did say it would warp. But i requested them to mount it on marine ply. i even offered to buy the marine ply and free issue it to them.
they assured me they had mounted it on marine ply. it has been installed about 2 months and it is now beginning to warp. should marine ply warp in wet damp conditions? i was under the impression it could be submersed in water