I am about to start a fresco on a cement wall.
I had to clean the wall before from the paint, and i am wondering (before I put my first layer of lime plaster) if I should use an acrylic bonding agent between the concrete wall and my first layer of lime...
Could a product like this acrylic agent be dangerous for lime and eventually deteriorate the pigments?

Any ideas about adding cement in the lime putty to make it more resistant? The fresco painter Jean Charlot did it in the 50's, his work is in perfect shape today, it doesn't look like the cement damaged the pigments or the lime mortar.