[Balty Knowles]

Thanks for the response guys,

Niell, I'm a Pommy & familiar with your terminology but have learned to use Americanisms after many years. I guess that would make me a Limey. I'm using stucco as a generic term for the additional high heat mortar coat that covers the dome before insulation.

Jim,

I will score the surface but it's as hard as a rock, I can use a grinder.
I'll continue with a much looser mix but the first coat will have already cured for a week by the time I'm able to re coat, do you think I'm OK?


I got he formula from Calucem, makers of Lumnite calcium aluminate. The chemist was very helpful. Interestingly he said DO NOT use lime with calcium aluminate because it is an accelerator & the mix goes off very quickly anyway, but to use equal parts sand & Lumnite with 1 part fire clay.

Thanks again