Print document
 43 of 47 
 
U
103
UNDERCOATED SURFACES
Undercoated surfaces should not be left exposed for too long a time. In exterior
it becomes chalky and in interior undercoats are likely to become soiled and
possibly greasy. Therefore, undercoats need to be over coated with finish paints
as quickly as possible.
Surface Preparation:
Exterior Surface: If chalky, it has to be washed off with clean water using a
sponge. If steel work is damaged allowing rust to grow the
defective areas should be stripped off for a bare clean
surface.
104
UNSOUND SURFACES
Any surface that is in such a condition that normal preparation will not provide a
satisfactory surface for painting. This applies to unpainted as panted surfaces.
Typical unsound surfaces include:
Permanently damp plasters, rendering, brickwork etc.
Crumbling and friable brickwork
Rot infected timber
Oil saturated absorbent surfaces
Flaking, cracking, blistering paint systems
Poor intercoat or surface adhesion
Finable and excessively chalking paint
Algae growth within paint films
Chemical contamination in depth
Surfaces with tacky or soft paint
Wax impregnated surfaces
For specific problem contact any nearest Berger Sales Center.