Hi All
I'm having a real problem painting my friends newly plastered walls. She initially painted a couple of walls, and found that the paint was being absorbed really unevenly, leaving lots of ridges of paint where paint was being absorbed - it basically looks like a map of the world. The paint seems to be sitting on top of the plaster in some areas, and being absorbed into other areas. She was told by her plasterer that it was because the paint wasn't sufficiently thinned.
I'm now doing the rest of the room for her, and despite using contract matt emulsion that is thinned as much as recommended for new plaster, I am getting a similar effect. I have used exactly the same paint and consistency at home and in her hallway, without problem. When you wipe any of the remaining bare walls, the water doesn't seem to be absorbing into the paint, other than where there are hairline cracks. I was going to try sealing another wall with alkali resisting primer, Zinnsser or dulux plaster sealer. Failing that, I think the only option is to lightly rub the remaining newly plastered walls before sealing. Before doing this, I would really like to understand why is this happening - any ideas?
Is it likely to be due to over-trowelling or a bad batch of plaster (the plasterer had apparently had to send several bags back).
My other concern is what to do with the now painted walls - I did sand back a bit, but when I apply paint the same effect happens. Is the only option to sand back to plaster?
Grateful for any help - it's a massive room!
I'm having a real problem painting my friends newly plastered walls. She initially painted a couple of walls, and found that the paint was being absorbed really unevenly, leaving lots of ridges of paint where paint was being absorbed - it basically looks like a map of the world. The paint seems to be sitting on top of the plaster in some areas, and being absorbed into other areas. She was told by her plasterer that it was because the paint wasn't sufficiently thinned.
I'm now doing the rest of the room for her, and despite using contract matt emulsion that is thinned as much as recommended for new plaster, I am getting a similar effect. I have used exactly the same paint and consistency at home and in her hallway, without problem. When you wipe any of the remaining bare walls, the water doesn't seem to be absorbing into the paint, other than where there are hairline cracks. I was going to try sealing another wall with alkali resisting primer, Zinnsser or dulux plaster sealer. Failing that, I think the only option is to lightly rub the remaining newly plastered walls before sealing. Before doing this, I would really like to understand why is this happening - any ideas?
Is it likely to be due to over-trowelling or a bad batch of plaster (the plasterer had apparently had to send several bags back).
My other concern is what to do with the now painted walls - I did sand back a bit, but when I apply paint the same effect happens. Is the only option to sand back to plaster?
Grateful for any help - it's a massive room!
