Zinsser Cover Stain is the usual recommendation. Worked well for me.
I've found that Rustin's does a better job than the Zinsser version. Covers better and requires fewer coats.
Shots fired :)
I should try the Rustin's. I am trying to convert to UK made products. Mostly because of the environmental impact of transporting paint or fillers. The decorating industry has embraced a lot of foreign products in the last 20 years.
@bq started
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Zinsser Cover Stain is the usual recommendation. Worked well for me.