PAINTING

PAINTING

Learning Outcomes:


After the class discussion, the students are expected to:
•
Know the objective of painting
•
Know how to prepare surfaces for painting
•
Know the tools needed for removing rust and old paint
•
Learn how to apply paint by brush
•
Know different kinds brush and their uses
•
Know the proper care and cleaning substance of brushes
•
Know what to paint and not to paint surgace
•
Know safety precautions in painting

1. OBJECTIVE OF PAINTING




The protection of metal surfaces is the chief
objectives of painting done aboardship.


Paints and varnishes are also used to decorate
surfaces.


The only effective protection against rust is good paint
properly applied to metal surface that have been carefully
prepared for painting.

2. PREPARING SURFACES FOR PAINTING

Even the most expensive paint is of little value if it is
applied on an insecure foundation.
Loose old paint, rush, dirt, dust, moisture of grease on any
surface will prevent new paint from adhering to.
Before painting steel, it is necessary to remove all scale,
grease, rust and moisture.

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Rust spreads even if it is covered
by paint.
Painting rusty surface causes paint
to flake off.

Rust and old paint may be removed in
several ways depending on the
thickness of the coating, thickness of
steel underneath, and materials stored

on either side of steel plating

.
3. TOOLS FOR REMOVING RUST AND OLD PAINT

•
Scraper – used for removing rust on plating surfaces.
•
Wire Brush – used as welded areas.
•
Sand Paper – used as abrasive to polish.
•
Chipping Hammer – used for thick rust.
•
Scaling Hammer or Jitterbug – never used in plating
less than ¼ inch in thickness.
•
Rotary Power Brush – it is operated by compressed air.
•
Power Sander – it is also operated by compressed air.
•
Rotary Chipping Tool.
•
Blow Torch – satisfactory but should be hot enough to
blister the paint and to burn wood underneath or to discolor
paint.

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4. APPLICATION OF PAINT BY BRUSH

•
Hold brush firmly by the handle not by the stock. If held by
the stock, hands become covered with paint and may cause
poisoning especially if small cuts are exposed and lead paints
are used.
•
Hold brush at right angle to the surface with the end of the
bristles alone touching and lift it clear to the surface when
starting the return stroke.
• Do not completely fill the brush with paint. Dip only the
end of the bristles into the paint. Do not charge the brush with
paint until the preceding charge has become sufficiently
exhausted.
• Apply paint with long stroke parallel to the grain of the
wood.
• Cross the work by laying on the paint over a small section
with parallel strokes. Then cross the first application with
parallel strokes at right angle to the first one, all laying off
(final) should be lengthwise.
•
For vertical surfaces, work should be laid off vertically.
• For overhead surfaces, ceiling panels should be laid off
fore and aft and the beams athwartships.
• Keep paint well-mixed while work is proceeding. Best
result can be obtained by applying two coats of thin or medium
body paint than one coat of heavy paint

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5. TYPES OF BRUSHES AND GENERAL RULES



Flat Paint Brush------------- large surface
Oval Sash and Trim Brush-----small surface
Fitch Brush--- small and very small surfaces
Oval Varnish Brush------------------------ rough

Flat Varnish Brush--------------- medium work
French Bristle Brush--------- high grade work
Lettering Brush -small surface & large work
Painter Duster-------------------- cleaning work

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NOTE:(Flat, oval and trim brushed are the two most
useful brushes)

3. CARE OF BRUSHES


Before using, rinse brushes with paint thinner and
soak in boiled oil for about 48 hours to make them more
flexible and easier to clean.
Care
after
use:
• Provide a container with compartments for stowing
different types of brushes for a short period.
• The bristles must not touch the bottom as they eventually
become distorted.

• Brushes which are to be used the following day should be
cleaned with proper thinner and placed in the proper
compartment of the container.

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•
Brushes not to be used soon should be cleaned in thinner,
washed with soap and water and hang to dry. After drying,
wrapped in waxed paper and stowed flat.
• Do not leave brush soaking in the water because it will
cause the bristles to separate into hunches, flares and become
bushy.

4.
PROPER CLEANERS FOR BRUSHES WITH
DIFFERENT FINISHES

Oil base paints and varnishes -- turpentine or mineral spirits
Rubber based paint-------------------- water
Shellac------------------------------------- alcohol
Lacquer ----------------------------------- lacquer thinner


5. WHAT NOT TO PAINT

• Start-stop mechanism of electrical safety devices and
control switchboards.
• Bell, pulls, sheaves, annunciator, chains, and other
common mechanical devices.
•
Dry sprinkling piping within magazines.
• Heat exchange surfaces of heating and cooling
equipment.
• Identification
plates.
•
Joint faces of gaskets and packing surfaces.
•
Rubber elements of isolated mounts, ground plates.
• Springs, strainers, threaded parts, hose and applicator
nozzles.
• Knife edges, rubber gaskets, dogs, drop blots, electrical
contact points and insulators.

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6. PAINTING SAFETY PRECAUTIONS

• Complete ventilation of the compartment is essential to
ensure immediate removal of vapors and paint dusts.
• Personnel using spray gun should wear clothing which fits
smartly or tightly at the ankles, neck and wrist.
• Approved respirator must be worn and parts of the body
not protected by clothing should be covered with petrolatum
(Vaseline).
• Smoking, open flames, welding, grounding of spray
equipment, chipping, and other spark-producing operations are
prohibited in the compartment when spraying is in progress.
•
Explosion proof portable lights should be used.
• Bulbs must not be replaced in a compartment or tank
being painted until flammable or explosive vapors have been
removed.
• Painted compartments long closed without ventilation
must be entered with caution.

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• Paint and varnish removers should not be used by
persons having open cuts on their hands, unless rubber gloves
are used.
• Paint and varnish removers should not be used in
confined spaces because some have dangerous anesthetic
property.
• If paint and varnish removers touch the skin and begin to
burn, wash off with cold water immediately and consult the
medical officer.
• Never use turpentine, spirits or other thinners for cleaning
your hands after work because they can be absorbed through
the skin pores. Use hand soap and water only.

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