All wall surfaces should be structurally sound and 100% dry. Sand finished plaster should be smoothed.
In order to insure good adhesion, old wallcovering and loose paint flakes should be removed.All wall surfaces should be primed with a suitable acrylic primer.
In order to insure maximum smoothness of installation, nail heads, nicks, gouges and other surface imperfection should be sanded smooth and sealed. On new walls, dry wall joints should be taped, bedded and sanded smooth.
Glossy surface should be either be sanded to dull the surface or an application of Heavy Duty Primer should be made.