>>2913690
>cover it with it and then apply waterproofing and paint it.
That would make it damp as shit m8

It will be made of lime mortar and plaster. This hygroscopic mortar needs to have vapour channel from inside to out so it can dry out. Anything you put on it thats not permiable will eventually have moisture stuck behind it and it will work its way out somewhere you wont want it. And a damp wall is a cold wall that will negate a lot of insulatiuon you might add. Educate yourself on non hydraulic lime and how it needs to be used. Don't consider hydraulic limes - they really aren't that permiable/breathable as they need to and most historic building surveyors now see them as inappropriate for most existing masonry buildings.
If you do it right the building should have passive dehumidification properties.
The material is cheap, but it's a learning curve.

>t. lime wall and decorative plasterer