Can old lime walls be painted directly with latex paint?
No, the surface of the lime wall is rough and the roughness is poor. Moreover, the direct emulsion paint roller brush on the surface of lime paint, latex paint will be peeling, cracking possible. Generally in the decoration, if you encounter this situation, will be the eradication of the lime layer, and then batch putty.
No, after the flat, from the new big white sandpaper smooth, after the putty, and finally on the latex paint
Even if not eradicate, but also in the batch of putty before, first on the wall rolling brush again glue, so that can improve the putty layer adhesion, and reinforce the lime layer. Do not grant old powder is not good, unless you do not require the quality of the decoration, or you can also roll a small area of brush, try
Generally speaking, this is not recommended.