Surface assessment

Quick test

Stability

Result

Measure

Press a thumbnail onto the surface to be
papered.

Make a cross-shaped incision into existing
coats of paint using a razor knife. Apply adhesive
tape and pull off.

The deeper the impression, the softer the surface.
Caution: The seams may open.
The more paint particles are stuck to the tape, the weaker the contact
between the wall and the wallpaper.
Caution: The wallpaper may come off.

Pre-coat the surface using a base
primer.

Give latex paints a coat of base primer.

Pre-coat the surface with pigmented
base primer.


Absorbency	Result	Measure
Moisten the surface with water using a spray gun.	If the water starts to drip off slightly, the surface has poor absorbency. Caution: The wallpaper may come off. If the water is absorbed immediately and a dark discoloration appears, the surface is highly absorbent. Caution: The seams may open.	Pre-coat the surface with pigmented base primer. Pre-coat the surface using thinned down paste or base primer.