What type of mortar to repair concrete wall?

[Funkis-Matte]

It's usually okay if you can get it to stick and it doesn't "roll" off, as it might if the surface is dusty.

Otherwise, it’s quickly fixed to redo it.

The risk is that without it sucks out all the water from the fix so that it dries too fast, and you'll notice if it's poorly attached or porous. Then you just have to scrape it off and redo it.

If you are going to build on with more husfix on top of already existing husfix, do you need to prepare the surface in some way, or can you just slap on new husfix?

 

[AXS]

If you want to add more husfix on top of already existing husfix, do you need to prepare the surface in any way, or can you just slap on new husfix?

Sand down if any part is too high, brush off and then just slap it on.

Dust is the worst; otherwise, it adheres well to most things.

 

[Funkis-Matte]

Have a question.
If the husfix becomes too loose when mixing. What can be done? I can't buy more right now. Do I wait until it hardens a bit in the bucket? Mix longer?
Regards

 

[Jocke Best]

Then it's unfortunately doomed. It doesn't thicken. Therefore, add a little water at the beginning.