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Coops is on the right track. Perma White is not the right thing. If it's regular paint and doesn't have any issues with nicotine or a lot of knotting you can denim it with a soft sanding pad (80-120 grit) and use Zinnser 123 which comes in a blue tin. If you want to cover staining on wood or prime bare wood then Cover stain (contains shellac) in an orange tin works very well. Perma White is a specialised solution, I think I've only used it in bathrooms suffering some mould staining.
Airhead
andos
I have lots of woodwork to be painted in my new place. Starting in the living room I bought 2.5l of Zinnser Perma White and thought it would do a good cover job, however each coat (4 so far) yellows pretty quickly which I assume is some sort of stain. Any ideas what paint I should be using?
Paging @Airhead as I think he'll know :-)