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PostPosted: Sun Oct 29, 2017 12:03 pm 
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We live in an old Farmhouse with stone walls. In a couple of rooms we have damp patches in the middle of walls or at the base, mainly in the kitchen and an unused living room. These are internal stone walls with plaster straight into the walls.

I recently had the plaster chipped off and the wall behind was dry, so I am assuming it is condensation.

Now that the walls have been replastered it has mainly turned a light pink, but a few dark patches remain. I am wondering how to prep the walls and what paints to use. I was thinking a mist coat, followed by Zinsser BIN or Zinsser 123+ or Classider Extreme. Then painting over the top with Zinsser Perma White or another condensation paint. What do you experts think??


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PostPosted: Sun Oct 29, 2017 6:30 pm 
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once mist coated no need for either of the Zinsser products ... they are primers/sealers. Topcoat with your suggested perma white.

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PostPosted: Sun Oct 29, 2017 8:23 pm 
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Thanks for the response.

Could I use the Zinsser product instead of a mist cost. I have already had the walls plastered once and used some damp paint over a first coat of gloss and that didn't work. This is the second attempt at plastering and I don't want to do it a third time, so want to use every product possible to keep the walls damp and flake free.

I am already worried about the dark patches of plaster and thought the Zinsser BIN would stop that coming through onto the top layer?


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PostPosted: Sun Oct 29, 2017 8:29 pm 
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Photos of some of the dark plaster.


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PostPosted: Sun Oct 29, 2017 8:40 pm 
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BIN does not like water. Scratching my head :scratch: you will not find ordinary paints that will resist dampness coming from underneath them. Some will resist better than others being penetrated from the top. If you put paint over the damp areas eventually the paint and probably the plaster will blow. I would run a fan heater for a few days and see if there is a change esp. at that corner patch that looks too wet. :-(



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PostPosted: Sun Oct 29, 2017 9:19 pm 
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I was hoping to get something to trap the water in. I will try the fan heater.


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PostPosted: Sun Oct 29, 2017 9:27 pm 
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NM20 wrote:
I was hoping to get something to trap the water in. I will try the fan heater.


I understand ... but then the water will go a bit further looking for a way out and so on or it will evaporate (given the right conditions) at the first/easiest place it finds. The thing is, if you have replastered twice you must identify the cause of the dampness and sort that out.



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PostPosted: Sun Oct 29, 2017 9:54 pm 
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You say they are internal walls and that when the plaster was hacked off the wall behind was dry, so maybe not a damp issue. How long has the plaster had to dry?. If it's remaining moisture yet to dry out, you can speed up the process by brushing methylated spirit on the wet areas, meths will evaporate any moisture it comes into contact with. Then before applying emulsion I would put either Ratcliffes Glutenglass or alkali resisting primer on those areas.



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PostPosted: Sun Oct 29, 2017 10:21 pm 
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With it being in an internal wall the only possibility is rising damp, but why only in this one place? We have concrete floors too.

Someone else has recommended GlutenGlass, maybe I will give that a go. I am in no rush to paint and it has only been four days since it was plastered, so maybe in another week it will be dry.

Thanks for all the help..


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PostPosted: Sun Oct 29, 2017 10:59 pm 
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You need to let it dry. If the patch in the middle of the wall feels powdery it could be efflorescence and the wall or the patch will need a coat of alcali resisting primer (zinsser gardz may do... read the instructions). The more concerning is the patch near the floor, that is dark and will take a while to dry out. Do not paint the new plaster whilst it is still drying unless you use non-vinyl matt emulsion paint.

As far as being on concrete.. is the concrete dry? Is the house warm?


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PostPosted: Mon Oct 30, 2017 7:38 am 
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The house is warm, but it is a big old house, so it isn't easy to keep warm. The walls are cold due to them being stone which is about a foot wide.

Is Zinsser Gardz the same as GlutenGlass? Sorry for all the questions, but I can't spend another year in a kitchen with patchy paint.


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PostPosted: Mon Oct 30, 2017 9:27 am 
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No, Zinsser Gardz is nothing like Glutenglass, and not suitable for damp patches. Glutenglass is designed for going over moist/damp areas. I think your walls need more time to dry, give it another couple of weeks is your best bet, in the meantime try the meths, it does evaporate moisture and is cheap as chips to buy.


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PostPosted: Mon Oct 30, 2017 10:25 am 
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So leave for another fortnight, then GlutenGlass over the damp, Zinsser Gardz over the efflorescence and then paint over with Perma White.

This is an extremely helpful forum, thanks for all the help, I will let you know how I get on (if you are interested?)



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PostPosted: Mon Oct 30, 2017 10:58 am 
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Forget the Zinsser Gardz, Glutenglass the dodgy areas or use alkali resisting primer.



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PostPosted: Mon Oct 30, 2017 11:28 am 
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Thanks Ian.


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