Is there someone knowledgeable who can clarify things for me?
The open time of mortar is, as I understand it, the time you have to apply the mortar to, for example, the wall before it becomes too stiff.
I've plastered with gypsum plaster before and noticed that after about 45-60 minutes it starts to become difficult to scoop up and throw on. You can extend this somewhat by stirring it, but it doesn’t add more than maybe up to 15 extra minutes.
When I had a plastering company at home that used regular plastering mortar B, they mixed everything in a concrete mixer, "tombola", which ran for quite a while and from which they filled their containers as needed.
My question is, can you mix gypsum plaster in a "tombola" to extend the open time, or is that only possible when plastering with plastering mortar?
The open time of mortar is, as I understand it, the time you have to apply the mortar to, for example, the wall before it becomes too stiff.
I've plastered with gypsum plaster before and noticed that after about 45-60 minutes it starts to become difficult to scoop up and throw on. You can extend this somewhat by stirring it, but it doesn’t add more than maybe up to 15 extra minutes.
When I had a plastering company at home that used regular plastering mortar B, they mixed everything in a concrete mixer, "tombola", which ran for quite a while and from which they filled their containers as needed.
My question is, can you mix gypsum plaster in a "tombola" to extend the open time, or is that only possible when plastering with plastering mortar?
Ok, yes, it's precisely the open time that's causing the problem. From one bag, I get about 2-2.5 square meters of plastered wall. But then I have to clean the container, wash the tools, etc. after each bag before mixing a new batch of plaster. It would be nice to be able to make a larger mixture at once...nimhed said:
Previously, I have plastered window recesses with gypsum plaster, where the top recess is rounded towards the wall, meaning there is no straight edge between the wall and the recess. Shaping it with gypsum plaster didn't feel too tricky after plastering a couple of rooms and getting decent technique.
Does anyone know how difficult it is to achieve this with regular plaster? What is the best way to do this?
Does anyone know how difficult it is to achieve this with regular plaster? What is the best way to do this?