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Great thanks folks. I'll pick up the Zinsser cover stain and report back. @Airhead you mean the Zinsser B-I-N product right?
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Sorry to be slow answering. As far as I remember c00ps is right, the B.I.N. is in a red tin and I don't use it anymore. Cover Stain is in an orange tin. http://www.zinsseruk.com/product/cover-stain/
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Just to add, if you don't have problems with the surface and it's not a bare redwood then sanding and Zinnser (bulls eye) 123 http://www.zinsseruk.com/product/bulls-eye-1-2-3/ Would be my choice. Just stir it before and during use because the solids settle quite quickly. It's water based and cover stain is oil based so it's easier to clean up. Otherwise cover stain and wash the brushes with white spirits.
B.I.N. is effective but it's a bit harder to work with.
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.