PS Magazine - TB 43-PS-598
PS, The Preventative Maintenance Monthly
ISSUE 598
SEPTEMBER 2002
M
O
R
E
Surface Preparation
Proper surface preparation is vital before painting with CARC. If you skimp here,
the paint won’t stick and you’ll have to start over.
Follow these steps:
1.
Wash the area to be painted with liquid
detergent, NSN 7930-00-282-9699, mixed
with water. Rinse the area with fresh water
and let it dry.
2.
Remove all loose paint and rust by hand
sanding or with an orbital grinder. Wet
sanding will help keep the dust down, but
you’ll still need to use a high-efficiency
respirator and eye protection. Your occupa-
tional health and safety office will help you
with the right respirator. A vacuum, NSN
7910-01-068-5662, helps with clean up.
3.
Sand the damaged spot down
to bare metal using sandpaper or
steel wool. Then sand the sur-
rounding paint, tapering up to
the topcoat surface. This process
is called “featheredging.”
4.
As soon as possible, but no more than four hours later to prevent corrosion, clean
the area to be painted with thinner, NSN 8010-00-181-8079. Wear gloves. You may
also need a respirator, depending on the size of the areas you have to clean and the
length of time you will be working. Your occupational health and safety office will
help you with the right gloves and respirator.
5.
After the thinner has dried, immediately
coat all bare metal surfaces with primer
pretreatment. This protects the surface and
helps the primer bond properly. Keep it off
the paint surrounding the bare metal,
though. That could keep the primer from
bonding to the old paint.
Check with your occupational health and
safety office for the right glove to use and
to find out if you need to use a respirator.
Let the pretreatment dry at least 30
minutes, but no more than 24 hours
to limit the potential for corrosion.
Now the surface is ready for priming.
Before You Start
The first question you should ask is “Does my equipment need spot painting?”
Touch-up painting is done to prevent corrosion, not to make your equipment look
better. If the paint is marred, but not deep enough to see bare metal, you don’t need
to paint.
Once you’ve decided spot painting is necessary, make sure you provide for your
safety. Here’s what you’ll need:
o
Clothes that cover all your skin.
Coveralls work well.
o
Boots and rubber gloves.
o
Face shield or splash goggles
to protect your eyes from paint and thinner.
o
Respiratory protection.
Depending on the condi-
tions and location for spot
painting, a respirator may
be required. Contact your
local occupational safety
and health office to per-
form an evaluation of your
work area.
If a respirator is required, they’ll do a baseline medical evaluation, fit-test you for
the proper respirator and train you in its use.
Next, protect those areas on
your equipment that you don’t
want covered with paint. Use
paper or masking tape to cover
lights, lenses, windows, data
plates,
hydraulic
cylinder
rods, hoses and exposed seals
and gaskets that might get
splattered when spot painting.
CARC will
begin peeling
off wood
surfaces
soon after
application.
Respirator may
be required
Wrap hydraulic
cylinders before
spot painting
NSN
8030-00-
850-7076
281-2726
165-8577
Size
1
1
∕
4
-qt
1
1
∕
4
-gal
5-gal
Order
the pre-
treatment
with these
NSNs…
Add pretreatment
to bare metal only
Taper old paint and primer
edges down to bare metal
Wash with detergent
and water
PS 598
SEP 02
52
oh,
no!
Topcoat
Primer
Bare metal
Don’t
use CARC on wood.
Wood expands and contracts
with changes in the
weather
-
CARC doesn’t.
598. 52-53 (C)
8/1/02
2:35 PM
Page 1
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