Used external fungicide masonry paint on internal walls - advice please

[Ekko]

Hi -- I have used Sandtex Trade High Cover Smooth Masonry paint on some internal walls, not realising that this paint contains a fungicide. Can I make this safe by painting over with a non-fungicide masonry emulsion or other internal emulsion?

 

[endecotp]

In what sense do you believe it is not “safe”?

Have you looked at the safety data sheet? https://www.sandtexpaints.com/wp-content/uploads/MDS-Sandtex-Trade-High-Cover-Smooth-Masonry.pdf

 

[Wayners]

Phone the technical helpline.
That's what I would do as I would want to be sure I was doing the correct thing

 

[Ekko]

Thanks for your replies. I've now checked with Sandtex and was told that it should not be used inside the house in view the fungicide and chemicals in it. They suggested painting over it with interior emulsion. I'm still curious about exactly why it's a problem given that its now up and dried. I guess there might a hazard in touching it or maybe the chemicals somehow leak into the surrounding air.

 

[endecotp]

I suspect you’ve not spoken to a person who knows much about this subject (on a Saturday afternoon). It wasn’t a chatbot was it?

Looking at the SDS for a random interior emulsion, it also contains a biocide. I believe this is common. A few years ago there were cases of “smelly walls” because some paints had removed these chemicals and the paints went mouldy in the tin. I guess they have since put them back.

 

[johnny2007]

I've used masonry paint on bathroom ceilings all my life.
Considering the amount of chlorine based products, bleach and all other chemicals used in bathrooms, my least concern would be for the paint (hopefully dry)

 

[Wayners]

I said phone technical.

If you asked me I'd say zinsser BIN to seal then emulsion over.

For future reference, never paint anything without reading data sheet online

 

[Ekko]

Thanks for all the replies. It was Sandtex's product advice line that I called (03 3002 40303, on Friday). On the safety data sheet, just as for internal-use paints, it mentions certain potentially harmful chemicals and gives directions such as ensuring good ventilation and washing spills off skin. But I can see no direction to not use the paint internally. And on the paint tin itself, in the safety advice section, there is no direction to not use internally. In my online searching on this, lots of people (DIY customers and and even some pro decorators) have used external masonry paint indoors. If there is a significant hazard to this it would seem sensible to make this clearly visible to customers. I mentioned this to the Sandtex advisor and they saw my point. and said they would pass this on to their production department.