513X408B - PPG Industries

technical data
DeSoto ® military water-borne primer
Description
DeSoto ® military water-borne primers are VOC compliant,
two component, chemically cured, chemical
and solvent resistant epoxy primers. These primers
are designed to be applied to aluminum and composite
surfaces prior to topcoating. DeSoto ® military
water-borne primers have excellent corrosion resistance,
and are fluid and solvent resistant. These
primers have excellent inter-coat adhesion and have
been used on a wide variety of military components
and weapon systems. Additionally, DeSoto ® military
water-borne primer (515X386) to MIL-PRF-85582
Type II Class C2 is used on military components
where low infrared reflectance is required.
DeSoto ® military water-borne primers are compatible
with conventional and HVLP spray equipment and
are easy to apply. DeSoto ® military water-borne
primers can be easily removed with chemical paint
strippers or with bead blasting. For further details on
the application parameters for these primers, consult
the application guide for DeSoto ® military waterborne
epoxy primers or contact your local PRC-
DeSoto International Application Support Center.
DeSoto ® military water-borne primers are qualified
to the following specification:
513X408B
• MIL-PRF-85582 Rev. B Type I Class C2
515X386
• MIL-PRF-85582 Rev. B Type II Class C2
DeSoto ® military water-borne primers are compatible
with the following topcoat specifications:
• MIL-PRF-85285 Type I & II
Application properties
DeSoto ® Aerospace Coatings
PRC-DeSoto International, Inc.
5454 San Fernando Road, PO Box 1800
Glendale, California 91209
(818) 240 2060 Fax (818) 549 7771
DeSoto ® military
water-borne
primer
Application temperature 68°F to 95°F
(18.3°C to 35°C)
Application humidity 20% to 85%
Product code
Base (MIL-PRF-85582 Type I) 513X408B
Base (MIL-PRF-85582 Type II) 515X386
Curing solution 910X831
Mix ratio (by volume)
base:curing solution 3:1
Viscosity
Initial mix,#4 Ford cup 25 sec. max.
Pot life (4 hours) 40 sec. max.
VOC, EPA method 24 340 grams/l
Gloss (60° specular) 10 units max.
Dry film density
Type I 0.00911 lbs/ft 2 @ 1.0 mil dry film
Type II 0.00873 lbs/ft 2 @ 1.0 mil dry film
Theoretical coverage
Type I 525 ft 2 /gal @ 1.0 mil dry film
Type II 506 ft 2 /gal @ 1.0 mil dry film
Recommended dry film thickness 0.8 to 1.2 mils
(20-30 microns)
Drying times @ 75°F (23.9°C)
Tack free 1 hour
Dry to stack 4 hours max.
Dry to overcoat 4 to 24 hours
Dry hard 6 hours
Full cure 14 days
Accelerated cure
15 minutes flash off @ 75°F
(24°C), then 60 minutes @
140°F (60°C)
Spray equipment
Compatible with conventional
and HVLP spray equipment
Color
513X408B (Type I) Yellow-green
515X386 (Type II) Green
Shelf life
12 months from date of manufacture
Date issued: 4/02
Supersedes: 2/99

DeSoto ® military water-borne primer
Performance properties
Service temperature
-65°F to 350°F (-54°C to 176.7°C) Conforms
Impact flexibility
10% GE impacter Conforms
Fluid resistance
MIL-L-23699 24 hours @
250°F (121°C) Conforms
MIL-H-83282 24 hours @
150°F (66°C) Conforms
Distilled H 2 0 4 days @
120°F (48.6°C) with topcoat Conforms
Corrosion
Salt spray
Passes 1000 hours Conforms
Filiform
Passes 1000 hours at
100°F (37.8°C) and 85% RH Conforms
Infrared reflectance
45-2700 nanometers
Type II only(515X386) Conforms
Note: The application and performance property
values above are typical for the material, but not
intended for use in specification or acceptance
inspection criteria because of variations in testing
methods, conditions, and configurations.
Storage life
Inspect the condition of the container to ensure
compliance to FED-STD-141, Method 3011.1. The
material should be stored at temperatures between
40°F to 115°F (4.4°C to 46.1°C) to ensure shelf life.
Health precautions
This product is safe to use and apply when recommended
precautions are followed. Before using this
product, read and understand the PRC-DeSoto
International “Safe Handling Guide” for aerospace
coatings and the Material Safety Data Sheet (MSDS),
which provide information on health, physical and
environmental hazards, handling precautions, and
first aid recommendations. An MSDS and the Safe
Handling Guide are available on request. Avoid overexposure.
All mixing and spraying must be conducted
with adequate ventilation and proper personal
protective equipment as recommended. Obtain
medical care in case of extreme overexposure.
For industrial use only. Keep away from
children.
For emergency medical information call
1-800-228-5635.
For sales and ordering information call
1-800-AEROMIX (237-6649).
DeSoto is a trademark of PRC-DeSoto International, Inc., registered with the U.S. Patent Office.
All recommendations, statements, and technical data contained herein are based on tests we believe to be reliable and correct, but
accuracy and completeness of said tests are not guaranteed and are not to be construed as a warranty, either expressed or implied.
User shall rely on his own information and tests to determine suitability of the product for the intended use and assumes all risks and
liability resulting from his use of the product. Seller’s and manufacturer’s sole responsibility shall be to replace that portion of the product
of this manufacturer which proves to be defective. Neither seller nor manufacturer shall be liable to the buyer or any third person for any
injury, loss, or damage directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other
than those contained in a written agreement signed by an officer of the manufacturer shall not be binding upon the manufacturer or seller.
Printed in U.S.A.

DeSoto ®
military water-borne epoxy primer
application guide

PRC-DeSoto International
Product codes
Base 513X408B / Curing solution 910X831 Yellow
Base 515X386 / Curing solution 910X831 Green
Specification
MIL-P-85582B Type I Class C2
MIL-P-85582B Type II Class C2
Use
This water based primer offers excellent corrosion inhibiting
properties and is designed for use with topcoats such as
MIL-C-85285 or MIL-C-22750.
Surface preparation
Good surface preparation is essential to ensure that the
full protective properties of the coating are obtained and
maximum adhesion is achieved. An outline of the
recommended surface preparation procedures follows.
Stripped aluminum substrates
To apply this primer, the aluminum surface should be
chemically cleaned and then treated with a chromate
conversion coating such as Alodine 1200 or Alodine 1000
per MIL-C-5541.
Recommended surface preparation procedures
1. Wet abrade with a fine Scotch-Brite pad.
2. Solvent clean with Desoclean ® 110 cleaner.
3. Alkaline clean. Rinse with warm DI water.
4. Acid etch with a mild acid brightener. Stir the acid
brightener using Scotch-Brite pads.
Note: Mix brightener according to manufacturer’s
instructions.
5. Wash with DI water to neutralize the acid brightener,
then look for water breaks on the surface. If a water
break free surface does not appear repeat steps 3 and 4.
6. Apply a conversion coating such as Alodine 1200
or Alodine 1000.
2
Sand and repaint
1. Wash surface to remove grease and dirt.
2. Lightly abrade surface to remove the gloss appearance.
3. Solvent wipe with Desoclean ® 45 cleaner or
Desoclean ® 110 cleaner.
4. Apply water-borne primer.
Caution: Some carbide sand papers contain silicone or
stearate binders. These will cause dewetting or crawling
problems.
Note: Apply tack rags lightly to the coating surface.
Excessive pressure will leave a tackifier residue on the
primer surface and can cause problems with dewetting
and crawling.
Aged water-borne primer
Aged water-borne primer is a primer that is more than two
days old since its application. A typical method for applying
new primer over aged primer requires the following
procedure:
1. Abrade the surface with 240 grit sandpaper to reactivate
the surface.
2. Solvent wipe the surface with Desoclean ® 110 cleaner
and wipe dry.
3. Apply the epoxy primer.
Composite substrates
1. Abrade the surface with 240 grit sandpaper.
2. Clean the surface to the manufacturer’s specifications.
3. Apply filler surfacer if required.
Material inspection prior to use
Prior to using, inspect the containers for damage or leaks
that may have occurred during shipping.
Note: If leaking cans are found do not use that material.
Mixing
Before mixing any primer the material should be allowed to
reach room temperature. This can be achieved by leaving
the material at room temperature for 24 hours before
mixing. Be sure all mixing and measuring containers are
clean and free from contamination. Shake the base or stir it
thoroughly until there are no solid particles left on the
bottom of the can. In the 3:1 system, mix three parts by
volume of base to one part by volume of curing solution.

Note: Do not use thinners or flow control agents from
another source. They often contain material that will
degrade the cure, adhesion, or appearance of the coating.
Note: Thoroughly mix each component prior to use. It is
recommended to continue to mildly agitate the material
throughout its entire pot life.
Always add the curing solution slowly while agitating the
base material. If the materials are added in the wrong order
or all at once, local areas of incompatibility can occur. This
will cause the resins to “kickout” into small particles. These
particles are difficult to disperse and can cause a rough
surface or cratering.
Note: Curing solution should be added just before painting
begins.
Note: Do not use the material beyond its shelf life which is
one year from the date of manufacture.
Pot life
The usable pot life of the mixed material depends on
temperature. Its typical pot life at 77°F (25°C) is four hours.
Higher temperatures can shorten the pot life.
An induction time of 15 minutes is recommended for these
primers after they have been mixed. Strain the mixed
material through a fine mesh cloth to remove any particles
that may have been introduced into the coating during
mixing and measuring. Stir or agitate the material before
and during use.
Application
Apply the water-borne primer to an average dry film
thickness of 0.6 to 0.9 mils (15 to 30 microns). This can be
accomplished by applying one coat of the primer with a
50% overlap pattern.
Equipment
The equipment listed below has been used successfully
in the application of these primers. This material is
intended for use with electrostatic as well as conventional
equipment.
Note: When spraying with a conventional spray gun
(pressure or siphon) use an atomization air pressure of
60-70 psi (4.1 to 4.5 bar).
HVLP
Air Verter
Tip size 1.2 mm to 1.5 mm
Air cap 10, 12
Compressor pressure 40-60 psi
Atomization pressure at gun 10 psi maximum
BINKS Mach I
Tip size #91, #94
Pot pressure 15-35 psi
Atomization pressure at gun 10 psi maximum
GRACO 1265
Tip size 0.047” to 0.057”
Pot pressure 15-35 psi
Atomization pressure at gun 10 psi maximum
Note: To achieve 45-50 psi (3 to 3.5 bar) air atomization
pressure in the spray gun, the regulated pressure at the
mixing pot should be set higher to compensate for air loss
through the hose. Table I lists air regulated pressure
requirements for different length hoses.
Table I
Air regulator pressure requirements to maintain
45-50 psi atomization pressure in the gun.
Air hose length Air regulator pressure
4 ft. (2m) 45 psi (3 bar)
15 ft. (5m) 50 psi (3.5 bar)
25 ft. (8m) 55 psi (4 bar)
36 ft. (11m) 65 psi (4.5 bar)
50 ft. (15m) 70 psi (5 bar)
75 ft. (23m) 85 psi (6 bar)
100 ft. (30.5m) 100 psi (7 bar)
Dry times
Dry times at 75°F (24°C) +/- 5°F and 50% +/- 15%
relative humidity.
Tack free 1 hour
Dry to stack 4 hours
Dry to overcoat 4 hours
Dry hard 6 hours
Full cure 7 days

Topcoat application
The length of time before a topcoat can be applied
depends on air temperature and the temperature of the
substrate. Lower temperatures will lengthen the dry time,
while higher temperatures will shorten the dry time. The
topcoat schedule after priming is as follows:
2-24 hours Apply the topcoat.
24-48 hours Lightly abrade the surface.
Clean with Desoclean ® 110 cleaner.
After 48 hours Lightly abrade the surface.
Clean with Desoclean ® 110 cleaner.
Apply a light coat of water-borne
primer, then topcoat.
Clean up
Flush equipment with a strong solvent blend such as
Desoclean ® 45 cleaner or Desoclean ® 110 cleaner.
The coating is a chemically reacting system. It is no
longer soluble after it has cured. For this reason, clean
the equipment as soon as possible after completing the
coating operation and always before the material has
cured. Note that even a fresh coating deposits a film on
the equipment that does not dissolve easily. Agitation
with a brush or cloth will help remove these deposits.
DeSoto and Desoclean are trademarks of PRC-DeSoto International, Inc., registered with the U.S. Patent Office.
Scotch-Brite is a trademark of 3M Corp.
All recommendations, statements, and technical data contained herein are based on tests we believe to be reliable and correct, but
accuracy and completeness of said tests are not guaranteed and are not to be construed as a warranty, either expressed or implied.
User shall rely on his own information and tests to determine suitability of the product for the intended use and assumes all risks and
liability resulting from his use of the product. Seller’s and manufacturer’s sole responsibility shall be to replace that portion of the product
of this manufacturer which proves to be defective. Neither seller nor manufacturer shall be liable to the buyer or any third person for any
injury, loss, or damage directly or indirectly resulting from use of, or inability to use, the product. Recommendations or statements other
than those contained in a written agreement signed by an officer of the manufacturer shall not be binding upon the manufacturer or seller.
Printed in U.S.A. Issued February 1999. Supersedes March 1997.
DeSoto ® Aerospace Coatings
PRC-DeSoto International, Inc.
5454 San Fernando Road, PO Box 1800
Glendale, California 91209
(818) 240 2060
Fax (818) 549 7627
www.prc-desoto.com
(Formerly Courtaulds Aerospace, Inc.)
Health and safety
This product is safe to use and apply when recommended
precautions are followed. Before using this product, read
and understand the PRC-DeSoto International “Safe
Handling Guide” for aerospace coatings and the Material
Safety Data Sheet (MSDS) which provide information on
health, physical and environmental hazards, handling
precautions, and first aid recommendations. An MSDS is
available on request. Avoid overexposure. All mixing and
spraying must be conducted with adequate ventilation and
proper personal protective equipment as recommended.
Obtain medical care in case of extreme overexposure.
For emergency medical information
call 1-800-228-5635.