Do I need to size previously papered walls?

[Pineman]

I'm just about to strip some wallpaper and then put up lining paper. Do I need to size the plaster even though it's been papered before, or is sizing just for fresh plaster? The current paper has been up the best part of 20 years.

[gregers]

i would,20 years of drying out,might suck like a porn star.

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[interiorpaintdecorating]

yes always helps