Probably. But patch it or paint the whole wall in Gardz then emulsion?
Gardz is fine patched then whole wall emulsion. Depending on emulsion you might even get away patching that too.
I think Gardz is specifically to seal alkaline filler and dusty / crumbly stuff though. I’m sure Zinnser make a more appropriate product
@dbr started
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Probably. But patch it or paint the whole wall in Gardz then emulsion?