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Sealer for walls prior to wallpapering

What sealer is best to apply to previously emulsioned walls prior to wallpapering

Hi Richard
I would personally seal with a pva based product and would always recommend cross lining the walls with a good quality lining paper 1000 or 1200 grade depending on the condition of the walls unless the wallpaper company recommend using there own brand of sealer.
Paul

I was thinking about either Zinsser Gardz or Bulls eye 1-2-3. Am I going the wrong way?