I've had this before.
dust and greace can have this effect.
the best option is to throughly clean the walls with soda then apply a sealant before trying the emulsion.
to seal, try watering down some PVA adhesive (1 water, 1 PVA). Paint this on and let it dry.
I've got a 1930's house and would like to strip back the entire banister to bare wood.
Having tried various methods; heat gun, paint stripper and sandpaper, I've decided that the best option would be to remove all these parts and send them away for dipping.
Is it possible to dismantle...