The plasterboard in a bathroom is badly damaged. A lot of the surface paper has been removed and there are patches of plaster in places, coated with a "rubbery" adhesive. For many reasons replacing the damaged board with new board is not an option. We can't remove the adhesive easily. Could we seal over the adhesive?
Could we line the existing drywall with new sheeting? If we do this,would we have to seal the damaged drywall or could we leave it as it is? Any suggestions welcome.