Could that amount of magnesium in high calcium quicklime when it slaked and aged over 2 year be useful for intonaco coat. Is that time of aging enough for magnesium to get slaked?

Calcium oxide %84
Iron oxide %5
Aluminum oxide %1.5
Magnesium oxide %15
Silica % 5
Is this ingredients useful for intonaco coat after aging (2 years)?
Thanks
Filip

Hi Filip,

Sorry it took me a while to reply. I hope you found a few topics in Fresco Forum on magnesium.

15% magnesium is fine for ornamental plasters, also marmorino, scagliola, etc.
It is also fine for "fresco undercoats" including arriccio. It will set faster and stronger.

However for intonaco I would not advise to use magnesium lime, because of the fast setting - you will have problems painting detailed giornatas. It will "lock" faster which will cause poor adhesion of pigment as well as while painting pigment (paint) will "slide" as you add layers.

iLia
http://FrescoSchool.com