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 (2) Finally, cross-brush lightly to smooth the painted surface and to eliminate brush or sag marks.
Very fast-drying finishes will not permit much brushing and cross lapping; in such cases, the paint shall be
applied, spread rapidly, and then allowed to dry undisturbed. Going back over a fast-drying paint will
cause piling up of the coating.
5-8. Paint Roller Technique. The techniques used in the application of paint with a roller are as follows:
a. Paint to Roller Procedures. To apply paint with a roller, pour the premixed paint into the tray to about
1/2 the tray depth. Immerse the roller completely, and then roll it back and forth along the ramp to coat
the cover completely. Remove any excess paint. As an alternative to using the tray, place the specially
designed galvanized wire screen (grid) into a 5- gallon can of the paint. This screen attaches to the can
and remains at the correct angle to load and spread paint onto the roller. The first load of paint on a roller
should be worked out on newspaper to remove entrapped air from the roller cover; it is then ready to
apply to a surface.
b. Paint Application:
(1) When a roller is passed over a surface, thousands of tiny fibers continually compress and expand,
releasing the coating and wetting the surface. This application of paint is in sharp contrast to other
application methods, which depend upon the skill and technique of the painter. The uniformity of
application by roller is less susceptible to variance because of painter ability than other methods.
(2) Always roll paint onto the surface, working from the dry area into the just painted area. Never roll
completely in the same or one direction. One good technique is to roll the paint onto the surface in a W
pattern and then fill in the area inside the W using horizontal or vertical strokes. Don't roll too fast. Avoid
spinning the roller at the end of the stroke. Always feather out final strokes to pick up any excess paint on
the surface. Feathering is done by rolling out the final stroke with minimal pressure.
a. Spray Painting Preparation. Before spray painting starts, ensure that the following steps are
completed.
(1) Mix the paint thoroughly. Strain the paint through a wire screen or cloth to remove skin and
coarse or foreign particles.
(2) Ensure that the air filter is connected to the main air supply line to prevent moisture and oil
particles from mixing with the paint.
(3) Spray Pattern Adjustment. After making initial adjustments to the air and liquid pressures, make
the final spray gun adjustment by observing the spray pattern.
b. Spray Gun Paint Application:
(1) The spray gun shall be held 6 to 8 inches from the surface being painted. Begin the strokes
before pulling the trigger and release the trigger before ending the stroke. This prevents piling up paint at
the beginning and end of each stroke. Always keep the gun at a right angle to the surface being painted.
Swinging the gun in an arc will result in uneven application and excessive overspray at the end of the
stroke.
(2) When painting corners, first spray within 1 inch of the corner. Then holding the gun sideways,
spray the corner so that both sides of the corner are sprayed at the same time. Speed of application
depends upon the material being sprayed, rate of paint flow, and surface to be coated.
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