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Tried the Cover Stain. It does block the tannin stains nicely, however it is horrible to apply. It has been a while since I used an oil based paint but I think this is particularly challenging.
Sharkstar-
In this weather, yes. It gets much thicker when it's cold. I always stir the Zinsser products a decent amount before applying. I had forgotten about the temperature issues as I avoid exterior work in the winter. Sorry about that.
You could try warming the pot in water or next to a radiator. There's a neat paint warming kettle solution that's popular in some of the colder european climates.
Airhead
Staining is difficult for water based paints to control. I use Cover Stain from Zinsser which is oil based and drys very fast (but is not micro vapour permeable, damn) Having read the tin for Zinsser 123 I note it says that you need to allow a much longer than normal drying time to improve the stain blocking. In my experience it doesn't stain block but I've not left it to find out if that improves with time.
tldr Use Zinsser Cover Stain for guaranteed results.