Zinnser Gardz is the best for sealing wall filler.
I do have some, first use was sizing for lining paper, very impressive. Interesting to have ARP characteristics shame it's interior spec only
Yes, we've been down this path before I think. Have you tried the new b.i.n. aqua. Really decent sealing qualities, quick drying and suitable for exterior.
@bluehuw started
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Zinnser Gardz is the best for sealing wall filler.