On 08/08/2019 21:13, Vir Campestris wrote:
On 07/08/2019 14:45, Martin Brown wrote:

If it is an acrylic based sealer it will fail the same way. You may
need a thin skim of plaster across the whole wall to bury the
offending lime.

I put a well-watered-down coat of ordinary emulsion over our new lime
plaster, and I've had no trouble.

ISTR It starts to flake off in places after about two or three years.

But only in the places where the pH is particularly alkaline - sometimes
you can get away with it.

--
Regards,
Martin Brown