Paint chalking cause ??

[Pepsiandshirlee]

What would cause paint to go white ?

 

[Wayners]

Never seen that before.
Wallpaper paste residue?

 

[opps]

As above, I haven't experienced that before

I am wondering if it is the result of salts in the plaster pushing their way to the surface.

If you wipe the area with a damp rag does it change colour?

How long ago was it painted?

 

[Pepsiandshirlee]

As above, I haven't experienced that before

I am wondering if it is the result of salts in the plaster pushing their way to the surface.

If you wipe the area with a damp rag does it change colour?

How long ago was it painted?

With wet wipe comes off and no change in colour . But then comes back week or two later . Would have been painted over a year and half ago . What is best solution going forward regarding what paint to use etc . Would just paint black again

 

[opps]

With wet wipe comes off and no change in colour . But then comes back week or two later . Would have been painted over a year and half ago . What is best solution going forward regarding what paint to use etc . Would just paint black again

Sorry, when you say no change in colour... do you mean that it looks black after using the wet wipes?

If so, I think it may be salts in the plaster pushing up to the surface.

Is it a chimney breast?

Without more info, I don't want to recommend products that will work in the short term but might fail in the longer term.

Alkali resistant primer can (sometimes) stops salts but I have seen those fail on victorian chimney breasts because of hygroscopic action- in short the old soot absorbs moisture and then releases it through the internal brickwork (and plaster) during the winter months. AFAIK, the only way to fix that is to hack the plaster back to brick and then use sand/cement.

 

[Pepsiandshirlee]

Sorry, when you say no change in colour... do you mean that it looks black after using the wet wipes?

If so, I think it may be salts in the plaster pushing up to the surface.

Is it a chimney breast?

Without more info, I don't want to recommend products that will work in the short term but might fail in the longer term.

Alkali resistant primer can (sometimes) stops salts but I have seen those fail on victorian chimney breasts because of hygroscopic action- in short the old soot absorbs moisture and then releases it through the internal brickwork (and plaster) during the winter months. AFAIK, the only way to fix that is to hack the plaster back to brick and then use sand/cement.

Yes looks black after wiping

Is actually doing any damage if just left and kept wiping ?

Yes was told about the alkaline primer Zinsser guardz or there was another one Zinsser peel stop . Was told they would work short term but may not long term .

Yes I believe would have been Victorian chimney breast but now in place is electric fire .

 

[opps]

Yes looks black after wiping

Is actually doing any damage if just left and kept wiping ?

Yes was told about the alkaline primer Zinsser guardz or there was another one Zinsser peel stop . Was told they would work short term but may not long term .

Yes I believe would have been Victorian chimney breast but now in place is electric fire .

It is difficult to say.

I don't want to see you spending money on products that may, or may not, fail.

I have been decorating for in excess of 30 years.

I had a regular customer that paid 20K to have his house repointed to deal with a damp patch on the inner face of the chimney breast on the third floor.

Over Easter 2021, I redecorated the room. I used SBR on the water stains on the chimney breast. Filled and then lined the walls, and painted. Winter 2021, the damp stain re-appeared. He rang a damp specialist that instantly suggested that it was hygroscopic action in the soot. The guy wasn't interested in such a small job. The advice was free. The advice however was to hack back to the brick work and use sand/cement.

Sorry, probably not what you want to hear.

On the upside, if you are getting problems at this time of the year, and there are no visibly darker patches then alkaline resistant primer may be all you need. Unfortunately, I have never seen a 0.5L tin.

With regards to a suitable Zinsser product- my advice would be to contact them. If it doesn't work, I would like to think that they would (partially) refund you.

If you do go down that path please do let us know how things go. It will help other people, and me.

 

[Pepsiandshirlee]

It is difficult to say.

I don't want to see you spending money on products that may, or may not, fail.

I have been decorating for in excess of 30 years.

I had a regular customer that paid 20K to have his house repointed to deal with a damp patch on the inner face of the chimney breast on the third floor.

Over Easter 2021, I redecorated the room. I used SBR on the water stains on the chimney breast. Filled and then lined the walls, and painted. Winter 2021, the damp stain re-appeared. He rang a damp specialist that instantly suggested that it was hygroscopic action in the soot. The guy wasn't interested in such a small job. The advice was free. The advice however was to hack back to the brick work and use sand/cement.

Sorry, probably not what you want to hear.

On the upside, if you are getting problems at this time of the year, and there are no visibly darker patches then alkaline resistant primer may be all you need. Unfortunately, I have never seen a 0.5L tin.

With regards to a suitable Zinsser product- my advice would be to contact them. If it doesn't work, I would like to think that they would (partially) refund you.

If you do go down that path please do let us know how things go. It will help other people, and me.

Thanks . Yes can let you know . Not sure when as got other jobs to sort first . Think it will be either painting or just wipe down every so often .

Don’t think be sand and cement anytime soon too much to do at moment

 

[opps]

Thanks . Yes can let you know . Not sure when as got other jobs to sort first . Think it will be either painting or just wipe down every so often .

Don’t think be sand and cement anytime soon too much to do at moment

The sand and cement will only be necessary if you start seeing wet patches over the winter months.

 

[Pepsiandshirlee]

The sand and cement will only be necessary if you start seeing wet patches over the winter months.

No wet patches in the last year and half . Always dry .

 

[opps]

No wet patches in the last year and half . Always dry .

Good, hopefully that means that a barrier paint will be sufficient.

You don't currently seem to have any blisters where the salts force their way through the paint finish, but that is, in part, because the emulsion is allowing the salts to rise to the surface.