Water-based 'Stain Block'

[JohnW2]

Hi there,

I'm used to using solvent-based 'stain blockers' (or, more cheaply, just oil-based undercoat) to prevent stains (e.g. 'water marks) showing through paint or wallpaper - and it makes sense that they work.

However, I've noticed that there are some water-based 'stain blocks' around - such as 'Dulux Trade Stain Block Primer' and Wickes 'Interior Damp Seal'. The concept of a water-based stain blocker sounds a little odd to me - do they actually work (i.e. do what it says on the tin)?

Kind Regards, John

 

[footprints]

Zinsser Bullsye 123 water based been around for years swear by it. Does most stains but Zinsser BIN for knots or really stubborn stains.

 

[JohnW2]

Zinsser Bullsye 123 water based been around for years swear by it. Does most stains but Zinsser BIN for knots or really stubborn stains.

Interesting. Thanks. I guess my 'intuition' is not necessarily correct, then! I wonder if other brans of water-based also work reasonably well?

Kind Regards, John

 

[silver50]

The Zinsser 123 is a good product but quite odd in that it looks thin on top of a stain as though it hasn't really worked. However when you paint over it with emulsion (or I guess what ever you're using) the stain then won't show

 

[JohnW2]

The Zinsser 123 is a good product but quite odd in that it looks thin on top of a stain as though it hasn't really worked. However when you paint over it with emulsion (or I guess what ever you're using) the stain then won't show

Thanks. Are other water-based ones similar in that respect, or don't you have any experience of them?

Kind Regards, John

 

[silver50]

Sorry, I don't know. I used to use the other Zinsser footprints mentioned but bought the water based one once to do a whole ceiling. I've used it 2/3 times since.

 

[footprints]

As said it locks the stain in to prevent it migrating through the paint, on dark stains two coats (it dries in an hour) will block it even better.

 

[Robbie uk]

I used the Zinsser 123 last week and it didn't stop the water stain at all. Went over with Zinsser Coverstain and that stopped it.

 

[silver50]

I used the Zinsser 123 last week and it didn't stop the water stain at all. Went over with Zinsser Coverstain and that stopped it.

Out of interest, did you try to overpainting the 123 though? As I was saying, it always seems to look like it hasn't worked and you could be forgiven for thinking that.

 

[Robbie uk]

I did yes, it was a white emulsion painted ceiling with a water leak from boiler in room above.

 

[Nozzle]

Also have a crack with Bedec stuff.

Nozzle