TM 43-0139
(5)
The booth air cleaning section not only removes paint mist from the exhausted air but acts as a means of
air distribution within the booth. There are several types:
(a)
Baffle type. An arrangement of metal baffles is simplest and provides a constant flow of air. Mist
removal and clean-up difficulties limit its use to low production applications.
(b)
Dry filter. These booths combine low cost with highly efficient paint mist removal, but have the
disadvantage of a variable airflow. The airflow continuously decreases to a point where the filters require replacement.
Dry filters must be disposed of carefully or a fire hazard will be created.
(c)
Water wash. These incorporate various combinations of water curtains and sprays to scrub the paint
mist from the exhausted air. They have the advantage of constant airflow, inherent fire protection, and high mist removal,
but at a greater cost.
(6)
Thought should be given as to how the booth will be maintained. Maintenance requirements can be
reduced if:
(a)
The booth is lined with strippable coating, such as wrapping paper or masking tape.
(b)
Air filters are disposable.
(c)
The glass shields over the booth lights are cleaned and coated with a light layer of white petroleum
grease.
b.
Portable Floodlights. Portable floodlights provide good illumination directly on areas to be painted. Their use will
avoid uneven paint coverage. All lights used should be of the vaporproof type.
c.
Can Shakers. A motor-driven paint can shaker (mixer) is a valuable piece of paint shop equipment. It saves
considerable time and eliminates stirring by hand and paddle.
Section II. BRUSH OR ROLLER APPLICATION
5-10. WHEN TO USE BRUSH OR ROLLER APPLICATION
Brush or roller application is used when:
a.
The volume of work does not justify setting up the spray apparatus.
b.
Spray equipment is not available or is inaccessible to the job.
c.
The operation is that of priming wood or other porous surfaces.
d.
The task of masking-out non-painted parts is extensive.
e.
Mist from the spray gun would damage the surroundings or create a fire hazard.
f.
Respiratory equipment, required for spray application, is not available.
5-11. Selection of Brushes and Rollers
a.
General. Factors determining the proper selection of a brush (see figure 5-15) for a specific task are:
(1)
The material to be applied.
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