Best paint to cover damp patch

[stargazerlil]

One resistant ugly damp patch keeps appearing on interior wall.
Root cause will be dealt with next year. I know what that is but cannot start the treatment yet.
So many damp paints out there which is the absolute best one to keep the stain at bay until the work can be done.

hopefully useful @stargazerlil

https://dampsurveyorsltd.com/paint-for-damp-walls/

edited to correct sp.

What is the cause?

If the cause is still there, the damp patch will probably just spread out behind whatever you paint over it and get bigger. It would be less work and cause less problems of you left it until the leak was fixed first.

Zissner cover stain is good but as others have said if the cause is still there it will likely only cover the old stain and if the leak extends you will see it.

i don’t know will be getting a damp surveyor in early next year.

I know it
l keep showing through zinsser cover stain, that didn’t even work on a stain from a fixed damp patch on the ceiling,

It’s not a leak.

I've actually found woodwork gloss to work. If you have any hanging around it's worth a go. Paint that on top of your stain, then paint emulsion on top of the gloss.

It will probably just reappear close by instead. Unless you painted the whole wall I think you would still see it? Unless it's rising damp, which will only reach so high.

I’m just looking for e temporary cover for a month, just because it’s doing my head in seeing it all,the time.

It all depends on what you think it could be caused by. I have a damp patch that won't go away. It's not mouldy but the paint lifts up in the rain. No paint has ever got rid of it. Pretty sure it's penetrating damp caused by old render outside, but I haven't been able to afford to fix it.

Yes I think that’s probably what I’ll do, apparently just reading that if youwipe down with something acid like vinegar first it also neutralises the salts

We've a patch of plaster that isn't actually damp, but l9oks like it is - according to damp surveyor, it has excessive salts in it (probably from proximity to old coal fire). I'm going to try your vinegar trick...otherwise, the only real solution for us is to remove the old plaster and get it redone.

That’s interesting, I wonder if that is the case of my mystery damp spot.

I have woodwork eggshell do you think that would work, it’s oil based?

If you try it do you mind reporting back? Especially regarding how the emulsion goes on top of the gloss? Good luck!

My local paint shop also recommended Zinsser, disappointing that it’s not effective.

Lithofin Stain Stop is what I’ve always had recommended.

But as pp say it won’t work if the source is still present

I have used gloss and then emulsion for dried water stains before and it works well.

@stargazerlil , when the cause of ours was pointed out it was obvious! The damaged area is on a downstairs internal wall, starting a foot or so up, and stopping a few feet from ceiling height. There's a clean patch with no "damp" in a neat line where electrical wiring runs to light switches (because the old plaster would've been removed just there).
Dunno if that helps you any!

I think I must have used oil-based satinwood first time round, and it worked. This time I couldn't find any leftovers so I used water-based satinwood and it didn't work. I bought some Zinsser and after about 4 coats, at which point I gave up, the stains were less noticeable but not totally gone.