What oil based anti damp paint?

To use on internal walls/ceilings where there is/has been some damp issues.
Is it worth getting the damp proof paints?
A decorator I know used to use an oil based undercoat. Guessing that would be thinner and need more coats?
Thanks.

Hm.

Is the damp issue coming from the outside in or the inside out? I’m no expert, but if your walls are damp then surely sealing them up from the inside is a really bad idea?

How old is the house? Older buildings were intended to breathe.

I’ve used oil-based paint and also Zinsser Cover Stain. Cover Stain dries a lot quicker
I’ve also used an aerosol stain cover, can’t remember the brand, but it didn’t go very far and the fumes were something else, brush-on paint ever since!

Whether it is oil or water based shouldn’t make a difference to the number of coats.

If it’s actual damp they do nothing. They are tougher, with better barrier properties and more opaque to hide what’s underneath. If there is damp then it’s likely it’ll eventually blister or peel off.

They are good at hiding stains though.

I’d go for one of the big brands. Crown, Akzonobel, Valspar. Go for a product that says it is designed to do what you want. They make stain and damp proof paints. The scrub able ones are also better in this regard as you can clean them.

In many ways I would have thought a water based paint, particularly the primer/undercoat would be best. That’s certainly the route you go down with green concrete where you can’t be sure of the moisture content. It allows it some ability to dry and cure with the surface it is painted on. An oil based would have more chance of being incompatible.

ronseal or zinnser have both worked well for me.

Thanks guys.
Ground floor is rising damp on party wall in old house so no dpc I’m guessing, ceilings are old leaks that have been sorted, some time ago as it goes and yet to see a paintbrush/roller 🙈

zinnser. then kitchen/bathroom emulsion worked in my little damp cupd been done for 3 years

If just blocking old (now dry) water stains the oil based satin finish works well, and is a way to use up old ends of cans. Be aware that the emulsion takes a much longer time to dry over the treated area, but it will be perfect in a day or two.

Bought some Zinsser cover stain cheers all.

Zinsser cover stain then bathroom paint for the final colour coats

Yes was thinking a silk type paint afterwards cheers.