I'm having a few walls skimmed, but having to take wall paper off first, a couple of Qs:

How 'clling on' free do the walls need to be, as despite removing the paper off there are still the odd tiny bits here and there.

I have made my best effort to remove most of the wall paper paste and all the walls are smooth, but once wet you can feel the tack of years of different pastes.

Can these be skimmed over or not ?

Cheers.