Technical data

4.4.3 Painting Difficulties and Remedies. Coating
troubles may be divided into five groups: (1) Inadequate
surface preparation, (2) Incorrect methods or techniques of
application, (3) Unusual climatic or atmospheric conditions,
(4) Unsuitable equipment, and (5) Faulty finishing material.
Inadequate surface preparation is self-explanatory and is
discussed in Chapter 3. Incorrect methods of application
should be discontinued upon discovery of the discrepancy.
Remedying incorrect techniques of application, however,
calls for training. The practice of allowing inadequately
trained personnel to apply coatings, particularly to aeronau-
tical surfaces, is unauthorized and dangerous. Conditions
such as adverse weather and humidity may cause the appli-
cation method chosen to be unworkable. Unusual climatic
and atmospheric condition can to some extent be remedied or
compensated for by temperature and humidity controls,
shielding from elements, etc. Consideration should always be
given to alternative methods such as hot spraying or even
brushing and roller coating on certain surfaces. Unsuitable or
faulty equipment can only be remedied by obtaining proper
equipment or repair. An experienced painter may be capable
of compensating for faulty materials to obtain proper results,
but this is an emergency measure only and must be with the
cognizance and authority of the quality control facility. Table
4-1 and Figure 4-14 through 4-22 lists common troubles of
spray coating operations with suggested remedies or methods
of avoidance.
Figure 4-11. Excessive Spray Fog
Figure 4-12. Paint Leaks From Spray Gun
TO 1-1-8
4-12