Is paint enough or do I need to shellac?

Question

The paint from my ceiling has fallen off due to humidity/no extractor fan being used.  The exposed white rings are not leaks etc but salt so I’ve been told by a plumber who inspected it.
The smell of plaster is coming off the ceiling.
Im a sensitive person so want to seal the plaster smell in or reduce it to negligable levels etc.

Will any water based paint seal the plaster smell in sufficiently or will I need to use shellac?

If I were to use shellac how long does it typically take for the shellac smell to go?

Is it neccesary to paint over shellac or can you just leave it as it is without painting?

Were one to paint over the shellac, how long do you let shellac dry for before you paint?

Thanks

d.george · Accepted Answer

You need to find the source of the humidity and correct that first before applying and paint shellac or varnish. When you fix the problem you should remove as much of the old paint coating as possible, then paint the surface with a shellac product like BIN Primer before painting. If you do not fix the humidity or the moisture problem from above nothing I know of will stick to that surface.

Correct answer by d.george on July 5, 2021

Is paint enough or do I need to shellac?

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