513X408B - PPG Industries

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PRC-DeSoto International Product codes Base <strong>513X408B</strong> / 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
Page 1 and 2: technical data DeSoto ® military w
Page 3: DeSoto ® military water-borne epox

513X408B - PPG Industries

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