On 09/08/2019 07:55, Jim K.. wrote:
Vir Campestris Wrote in message:
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.

Andy


New...

If the alkalinity is the problem why would old lime be worse than new?

Andy