Just had room newly plastered a few weeks ago. Mist coated the room yesterday with leyland contract matt. Today thought I'd give it a coat of leyland matt on the ceiling and walls but theres a few patches that arent covering particularly well and wondering if the plasterer has been a bit slap happy with pva or something. If so what can I use that wont flash through any new coats of paint. Tried some zinsser stain paint in the past and had a nightmare trying to stop it flashing through. The white isnt going to be final colour on walls but I doubt this would cover another with another coat. Taken a couple of pics but not overly clear.