Plastering of wall in laundry room

[aweste00]

I am renovating the laundry room in the basement, an old house with outer walls made of stone and concrete where I have knocked off loose plaster to then replaster. I used plaster mix C but find it a bit too coarse to paint directly on, and it's also difficult to get even transitions to the surfaces that didn't need to be knocked off. Can I use something finer before painting?

I also have problems with small stones in the mix that leave marks when plastering, it's annoying and requires a lot of extra work. Anyone else having this problem? I'm using Finja's plaster.

 

[Stefan N]

Run 1mm on the outside. https://www.se.weber/fasad-puts-och...h-system/putsbruk/weberbase-136-finputsbruk-c

 

[cpalm]

Now, it doesn't show much in the pictures, but it looks like the previous rendering is brushed, meaning a brush was used over it instead of smoothing it out. Using the same technique makes it easier to match, and it also looks nicer if the surface is homogeneous, even though smooth render is really nice.

The "stones" are there because you are using a coarse mix, which is a prerequisite for being able to apply reasonably thick layers. It looks like you're doing well - there will always be some scratches (you can address that with finish plaster as @Stefan N writes if you want a finer finish), but it also depends on timing, technique, and the hardness of the float.

But if you want to mimic the existing render, you are looking for an even coarser texture.
No problem painting on it if you use the right paint.

 

[aweste00]

Run 1mm on top. [link]

Thanks!
Does it adhere to the existing painted plaster?

 

[aweste00]

Now it doesn't show much in the pictures, but it looks like the previous coating is brushed, meaning they've gone over it with a brush instead of smoothing it. If you use the same technique, it's easier to make the joint seamless, and it looks nicer if the surface is homogeneous, even though smooth plaster can be really stylish.

The "stones" are there because you're using a rough mortar, which is necessary to make reasonably thick layers. I think you’re doing well - there will always be some scratches (you handle that with fine plaster as @Stefan N writes if you want a finer finish), but it also depends on timing, technique, and the hardness of the float.

But if you want to mimic existing plaster, you're looking for an even rougher texture.
No problem painting on it if you use the right paint.

Now it doesn't show much in the pictures, but it looks like the previous coating is brushed, meaning they've gone over it with a brush instead of smoothing it. If you use the same technique, it's easier to make the joint seamless, and it looks nicer if the surface is homogeneous, even though smooth plaster can be really stylish.

The "stones" are there because you're using a rough mortar, which is necessary to make reasonably thick layers. I think you’re doing well - there will always be some scratches (you handle that with fine plaster as @Stefan N writes if you want a finer finish), but it also depends on timing, technique, and the hardness of the float.

But if you want to mimic existing plaster, you're looking for an even rougher texture.
No problem painting on it if you use the right paint.

OK, thanks!
It's hard to see, but three of the walls had a rather smooth surface but with some irregularities. Maybe it's clearer here:

However, one of the walls was built later and it is definitely brushed:



On the right side, I've built up a new wall, and I've been considering whether I should try to brush it to make it blend in. But I think I'd rather have all the walls finely plastered; the question is whether fine plaster will adhere to the paint.