Can the cement board cut off the wall directly
Cement board partition wall directly scraping paint, will fall off.
Cement board partition wall can not be directly putty putty, need to hang the network (as shown below), then spatula, scraping putty.
Mud wall can not be directly painted, need to do something to deal with, as follows: grass-roots treatment, the new cement mortar wall should not brush paint, the general need to wait six months after the oil. If you must paint, can be washed every 2 to 3 days a time to wash the wall, repeated many times. Brush oil before, but also the application of 10 to 20% of the dilute hydrochloric acid water coated once to neutralize the cement mortar in the remaining alkali, to be a moment after the water to wash the acid water, dry. So that the new cement mortar surface layer will not appear after the paint color, loss of light, from the volume of the phenomenon. Old cement mortar wall is best to use pig water and water into rice soup-like, with rows of rituals in the cement mortar wall full brush once, dry and then full of pig blood putty. General cement mortar wall paint before the surface to remove the dust clean, with plaster putty cracks, depression and other injuries filled. Paint is also a very critical step, the general wall can be twice brushing enamel, the second time to wait for the first pass and then brush. Oil brush in the brush when the direction of movement should be about to brush down, so brush evenly, the connector is not easy to see.
Due to the cement board surface is too smooth, not with the putty layer (or sand layer) very good bonding, the need to increase a layer of wire mesh to increase the degree of sewing. Need to first barbed wire fixed on the wall, and then sandy gray leveling; until the sand ash dry, then putty putty, paint.
Is not, even if the brush on the long time is to fall off, unless the picture is hydrophilic, it is a kind of hydraulic map, otherwise it is not enough.
