Removing expanding foam from brick

[embra]

Any tips for removing cured PU expanding foam from brick / mortar walls? 

 

Internet search suggests mechanically removing as much as possible (stanley kinfe / brush), and then using acetone on a rag.

 

Any tips most appreciated

[SteamyTea]

19 minutes ago, embra said:

acetone on a rag

Good luck with that.

Get some dichloromethane, what the PU industry uses.

[Timedout]

Is it exposed to the sun? It is not UV stable. After a while is goes crumbly and mostly comes off with a light wire brush (not powered). The blue flexi foam is another matter. 

[embra]

Thanks folks for the replies! 

 

3 hours ago, SteamyTea said:

Good luck with that.

Get some dichloromethane, what the PU industry uses.

 

Can you recommend any commercially available products that are equivalent? Keen to double check application guidance to understand if there would be any adverse effects to the bricks / mortar. I think I'll go with suggestion below as a first pass, then resort to chemicals if I'm not getting anywhere.

 

3 hours ago, Timedout said:

Is it exposed to the sun? It is not UV stable. After a while is goes crumbly and mostly comes off with a light wire brush (not powered). The blue flexi foam is another matter. 

 

Yes, it is exposed to sun. I had also been suggested by others, so will leave it a few weeks (or longer?) for UV reaction, and then try brushing.

[SteamyTea]

2 minutes ago, embra said:

Can you recommend any commercially available products that are equivalent

You can get it on eBay/Amazon

I think Nitomors uses it as the active ingredient.

 

But as others say, leave it to weather, PU hates water and sunlight.