I have installed new windows and need to patch up the plaster around them. The house has been rendered. Originally, the job was planned for spring, but the windows arrived last week, corona construction boom, etc.

What type of plaster should I use? Frost is coming soon, and I'm very doubtful that pure lime plaster will have time to cure (Falun). Is there any KC-plaster that might work or hydraulic lime mortar? Or should I just apply a thin layer over the winter?

It's not many square decimeters that need plastering, so it's not a disaster if some parts need to be redone.
Close-up of a green window frame showing exposed lath and damaged plaster on the surrounding wall, with part of the wall removed.

Newly installed window with surrounding roughcast wall. Wooden planks frame the window edge. Wall needs patching due to prior construction delays.
 
Hydraulic lime mortar should work. Absolutely no cement mortar on that.........
 
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KungAnka
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I can easily get hold of Hydraulic lime mortar C, but I assume it should be D?

I assume the entire facade was originally done with regular lime mortar (E?). Should you prime with C even on revitered (reed mat, etc.) or use D directly?
Bag of Hydraulisk Kalkbruk C pack, 20 kg, with illustration of a building on the packaging. Suitable for restoration work. Bag of hydraulic lime mortar D, 20 kg, from Combimix with an illustration of a house on the packaging.
 
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