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Assuming you mean 'drywall', the answer is YES. The porosity of the plaster joints is very different from the paper areas, and you must have a primer coat to seal the surface. Otherwise you'll have a blotchy paint job.

If you are using wallpaper direct to the wallboard, then the primer in this instance would be a coat of glue size. [Your name for it may differ, but it is basically just a coat of the wallpaper glue.]

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Q: Do you have to prime your wall after the plastering and sanding been done?
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