Handful of bonding in first coat of finish, get it on thick enough to cover artex, lay in as normal but let the first coat firm up quite abit.
How rossi ? What happened ?
Check the adhesion strength of the artex to the walls and ceilings before you plaster, test a bit with pva, let if soak in , if it scrapes off, bothers for thee
Especially on the ceiling. Gravity is a bitch!!!