HELP with external salts please!

[CeeVee]

OK there was efflorescence under some render...so hacked it off and washed with the acid.
Nowhere stocks anti sulphate cement apparently so we scratched over where we'd washed with s/c and sika.
Now the salts come straight through.
I'm supposed to be topping this week with mono...the brick was too bad to just rendaid....what would you do?

Can you rendaid over bitumen?

 

[zolco]

Feb tanking slurry might work

Sent from my Nexus 6P using Tapatalk

 

[irish_spread]

Sika is s**t. Best stuff to use is Sovchem's waterproofed which has a built in salt neutraliser . It's available to order by courier with a £5 delivery charge if you order 2 gallons. I've never used it on outsides though but their tech helpline are first class and will help

 

[irish_spread]

Next day delivery aswell

 

[CeeVee]

Sika is s**t. Best stuff to use is Sovchem's waterproofed which has a built in salt neutraliser . It's available to order by courier with a £5 delivery charge if you order 2 gallons. I've never used it on outsides though but their tech helpline are first class and will help

Is it a paint on solution or mix with slurry/render?
Can you put anything like that in rendaid?

 

[irish_spread]

You mix it in with your s n c like normal waterproofer. It may help to slurry coat with SBR/cement first to tank it a bit ??? But if you ring their helpline they are very good, unlike sikas tech support.

 

[irish_spread]

Google Rendermix from Sovchem (sovereign chemicals)

 

[Bagrat]

Maybe even scratch in the ready render of which sulphate resistant .