u/TomasHAAAAA

Hi everybody.

I recently moved in to an 80's soviet building in Vilnius and am removing old wallpapers so I could paint the room, but I'm not entirely sure what the old glue looks like and how much I need to grind the walls. The wallpapers came of pretty much without a struggle. Most just fell from their own weight. How do I know to what layer I should grind the walls, so I can apply primer and calmly paint? Or could I just apply primer without removing the old glue since the primer makes everything stick together?

Thank you for your help in advance