What do you repair aerated concrete with?

[FemTummar]

I have made a channel in a load-bearing lightweight concrete wall and installed VP pipes. What should I use to fill the channel?

 

[anders07]

Plaster!

Buy a spray bottle that you can pump pressure into and buy primer. Mix primer and water 1:4 and spray it on the channel.
Let it soak for a while and then apply plaster. The plaster should have the consistency to stay on the spatula without changing shape if you turn it upside down. Use a regular spatula to smooth out the plaster.
When the plaster has dried for about 20-30 minutes and is slightly damp, you can "smooth" it with a rubber smoother (a plate with rubber/hard foam underneath) or apply regular hand filler. If you use a hand filler, you must be careful with the plaster so it doesn't become too much. The plaster is very difficult to sand...

//Anders

 

[ZipLock]

Gypsum plaster!

Buy a spray bottle that you can pump pressure into and buy primer. Mix primer and water 1:4 and spray it on in the channel.

Tell me more! What is primer and why do you use it? Is it the same technique if you're filling in after replacing a conduit in a plastered brick wall?