Dark marks after painting

UncleZen

I have dark marks on a wall im painting.
The wall used to have tiles on it. The tiles and glue have been removed. What's remaining was bare plaster and the odd bit of stubborn paint which ive smoothed as much as i can. Ive PVA'd the area, filled and smoothed. Then I've primered - zinsser 123. Now I've painted a test area, but i can see a dark area where the filler was (filler is ronseal smooth finish). It looks to me like the paint has been absorbed into the filler (?). What can I do to prep the area to stop this happening (more PVA?).
Pic of test area (it looks worse in real life).

bjorn_toby_wilde

Sorry but PVA shouldn’t be used under paint and emulsion won’t adhere properly to it. It’s a great woodworking glue and a good primer when plastering over blocks, but it’s used for all kinds of things now that it really isn’t intended for.

You may be able to clean the emulsion off the wall then seal it with something like Gardz to stop the filler flashing through. I’m not sure. Maybe ask on a decorators forum like the Screwfix forum?

rob7475

Some fillers do cause the paint to flash more than others. I always use Toupret fillers. Another tip is to do a apply a watered down mist coat of your paint before applying two full coats. I usually water down with around 20% water for an initial coat before two full top coats.