hi guys
sorry if the subject sounds familiar, I believe my problem is different from previous posts.
I had a bedroom plasterboard ceiling painted by multiple coats of paint. when I started redecorating, I found out that the old paint was coming off in sheets -- so I took it all off. what I was left with was what looked like a decent plasterboard paper surface (dark yellow in colour for some reason). I smoothed some areas (joints, holes) over with white gypsum-based filler, sanded, but the rest remained this yellow paper.
I painted three coats of Leyland contrace water-based matt emulsion paint and I can still see the yellow bleeding through, but not in the places where I used the filler (there it's properly white).
now, there was never water damage on this ceiling. I don't think it's cigarette stains, because if they were, I would have noticed them on the old ceiling paint. it's the paper! the surface is clean and dry.
as I paint it looks perfect, but as it dries, the yellow starts coming through.
I also noticed that the paint dries very quickly. maybe what's happening is that the water from the paint gets absorbed by plasterboard too quickly for polymerisation to happen in the new coat.
I understand that I need to seal the surface somehow. how do I do it without costing a fortune and doing 10 more coats? it's already three coats, how do I do it so the new coat still sticks? if I have to wash off my three coats I might as well remove that stupid yellow plasterboard altogether and build a new ceiling.
water-proof PVA? undercoat? sealer? acrylic primer?
oil-based primer sounds like overkill TBH.
any advise please.
thanks!
sorry if the subject sounds familiar, I believe my problem is different from previous posts.
I had a bedroom plasterboard ceiling painted by multiple coats of paint. when I started redecorating, I found out that the old paint was coming off in sheets -- so I took it all off. what I was left with was what looked like a decent plasterboard paper surface (dark yellow in colour for some reason). I smoothed some areas (joints, holes) over with white gypsum-based filler, sanded, but the rest remained this yellow paper.
I painted three coats of Leyland contrace water-based matt emulsion paint and I can still see the yellow bleeding through, but not in the places where I used the filler (there it's properly white).
now, there was never water damage on this ceiling. I don't think it's cigarette stains, because if they were, I would have noticed them on the old ceiling paint. it's the paper! the surface is clean and dry.
as I paint it looks perfect, but as it dries, the yellow starts coming through.
I also noticed that the paint dries very quickly. maybe what's happening is that the water from the paint gets absorbed by plasterboard too quickly for polymerisation to happen in the new coat.
I understand that I need to seal the surface somehow. how do I do it without costing a fortune and doing 10 more coats? it's already three coats, how do I do it so the new coat still sticks? if I have to wash off my three coats I might as well remove that stupid yellow plasterboard altogether and build a new ceiling.
water-proof PVA? undercoat? sealer? acrylic primer?
oil-based primer sounds like overkill TBH.
any advise please.
thanks!