Paint and pleaser problem/question

[Lolpop]

We had our walls skimmed and then mist coated and painted as we should have.

There is a patch on the fireplace that is damp and we have now sanded this down.

I have been advised to use an oil based primer and then paint over that. Should we mist coat before using an oil primer? Thanks

 

[blightymam]

Without fixing the source of the damp, you'll end up with the damp coming through eventually, no matter what paint you use.