Pre-Diluted Oil-Based Temporary Coating – 55 Gallon Drum (Cortec® VpCI®-369 D)

Description

VpCI®-369 D is VpCI-369 supplied pre-diluted: a wet-film removable oily coating that protects and lubricates in aggressive environments. The 55-gallon drum is the dip-tank package for a preservation line, ready to use with no on-site blending.

Cortec’s brochure notes that VpCI-369 “can be diluted with oil” and applied by spraying, dipping, brushing or rolling; VpCI-369 D is that dilution done at the factory so the product goes straight into the dip tank or sprayer with no on-site blending. Do not dilute it further. The film is the same translucent, oily, scratch-resistant and self-healing coating, and the protection is by the VpCI-369 chemistry, which Cortec rates 4 (outside, uncovered storage) on carbon steel, stainless steel, cast iron, aluminum, galvanized steel, copper, brass and solder in its Product Consultation Guide. VpCI-369 itself is the commercial equivalent of MIL-PRF-16173E Grade 2; for a contract that calls out the specification, buy the concentrate.

Typical applications

• Equipment preservation during storage and layup
• Dip tank applications
• Offshore equipment
• Preservation lines that dip or spray parts straight from the drum
• Chains, wire rope, gear teeth and threads that must stay lubricated in storage
• Automotive, heavy equipment and power plant spares
• Machined surfaces on equipment stored uncovered outdoors

How to apply VpCI-369 D

1. Surface preparation. The substrate must be free of grease, oil, dirt, fingerprints, drawing compounds, rust inhibitors and anything else that would affect adhesion. Cortec recommends VpCI-440 or a similar phosphatizing pretreatment on production lines and a minimum of NACE No. 3 / SSPC-SP6 commercial blast on structural steel. No wash primer is needed on aluminum or galvanized steel. The surface must be dry; water in a dip tank will emulsify an oil-based product.
2. Mixing. Agitate the drum before use so any settled inhibitor is back in suspension. VpCI-369 D is ready to use; do not add oil or solvent.
3. Conditions. Apply between 45 and 90 °F (7 to 32 °C) with the surface at least 5 °F (2 °C) above the dew point. The product is not freeze-sensitive.
4. Equipment. Spray, roll, brush or dip. HVLP or conventional spray: 0.009 to 0.021 in tip, 45 to 55 psi air and 10 psi fluid, 3/8 in ID fluid hose no longer than 50 ft, dual-regulated pot kept at gun height. Airless or air-assisted airless: 0.015 to 0.035 in tip, 1,800 to 2,500 psi, 3/8 in ID hose (a 1/4 in whip end is fine) no longer than 100 ft. Tip size depends on pressure and viscosity. In a dip tank, submerge long enough to wet every recess, drain and let drips fall back into the tank. Keep the tank covered when not in use.
5. Film build. The VpCI-369 recommendation is 1.0 to 3.0 mils (25 to 75 µm). Because the product carries extra diluent, expect a thinner film and higher coverage per gallon than the concentrate at the same application; check with a wet-film gauge.
6. Drying. None. The film stays oily; the part is protected as soon as it is coated. Wrap or crate so the film is not wiped off.
7. Cleanup. Clean tools with butyl acetate while wet; for dried residue use butyl cellosolve or MEK, following the solvent manufacturer’s safety directions.
8. Removal. For a film at the recommended DFT: spray the surface generously with VpCI-414 at 60 % in water (the coating-removal strength on the VpCI-414 data sheet), let it sit 10 to 15 minutes, then power-wash at 115 to 160 °F (46 to 71 °C) and 50 to 300 psi. Repeat until the coating is gone. VpCI-414 is the alkaline cleaner Cortec specifies for stripping its temporary coatings; the EcoAir VpCI-414 aerosol handles small areas.
9. Storage. Keep the container sealed and do not store above 100 °F (38 °C).
10. See the Cortec coatings application guides and comparison table for the shared spray, prep and storage instructions across the Cortec coating range.

Compatibility

Cortec’s elastomer table lists the parent VpCI-369 as compatible with Viton (FKM) at 10 %; other elastomers are not reported. Test seals, hoses and gaskets that will sit in contact with the film. See the full oil and elastomer compatibility charts.

Where it fits in the Cortec line

Choose VpCI-369 D over VpCI-369 when the product goes into a dip tank or sprayer as delivered; choose the concentrate when you set the oil ratio yourself or need the MIL-PRF-16173E Grade 2 equivalence on paper. VpCI-368 D is the pre-diluted solvent-based sibling that dries to a waxy film. For indoor or sheltered storage the ready-to-use oil VpCI-322 at 1:9 is the lighter option. The CorShield VpCI-369 aerosol covers touch-up. The specified remover is VpCI-414. Before coating rusted steel, derust with VpCI-422 or convert the rust with CorrVerter. Browse the full Cortec VpCI line.

Field notes

A construction-equipment OEM had pre-qualified VpCI-369 as a five-year indoor backup rust preventive for service parts. When the incumbent supplier failed in summer 2021, tinted VpCI-369 was ordered within two months and sprayed or dipped on all large service parts; in use since August 2021, it sprays easier and is expected to become permanent. (Cortec Case History #760)

A global steel and mining company shipping 30,000 railway wheels from Russia to the United States ran a selection including 264 hours of salt spray and months of open-warehouse storage. VpCI-369 beat VpCI-368 D and VpCI-325; 1.2 tonnes were applied by spray or brush at about 23.8 m² per liter (970 ft² per gallon). (Cortec Case History #751)

An LNG module builder in Russia stored 28 to 60 inch pipe outdoors 6 to 12 months after open rail-car transit, rejecting solvent wax because removal had to be quick. VpCI-369 airless-sprayed in two passes to 60 to 80 µm (2.4 to 3.1 mils) at about 1 liter per 25 m² (1 gallon per 113 yd²) gave 12 months of outdoor protection. (Cortec Case History #673)

Specifications

Film	Wet-film, removable, oily
Removal	Use a VpCI-41x series alkaline cleaner/degreaser
Type	Oil-based temporary (removable) coating, supplied pre-diluted and ready to use
Dilution	None; do not dilute further
Salt spray / humidity	100 hours ASTM B117 / 1,000 hours ASTM D1748 (VpCI-369 D at standard dilution)
Recommended film thickness	1.0–3.0 mils (25–75 µm); wet film equals dry film
Volume solids	94%
VOC (ASTM D3960)	0 g/L
Coverage	1,508 ft²/gal @ 1.0 mil DFT (36.9 m²/L @ 25 µm)
Viscosity	35–40 s Zahn #2; 80 cPs at 20 °C
Weight per gallon	7.65 lb (0.91 kg/L)
Flash point	294.8 °F (146 °C)
Dry time / cure	None; non-drying film
Surface preparation	Clean, dry and contaminant-free; NACE No. 3 / SSPC-SP6 on structural steel; no wash primer needed
Application temperature	45–90 °F (7–32 °C), surface 5 °F above dew point
Listings	NSN 8030-00-244-1295, 8030-00-244-1297, 8030-00-244-1298, 8030-01-149-1731
Metals	Carbon steel, stainless steel, cast iron, aluminum, galvanized steel, copper, brass, solder
Consultation guide rating (VpCI-369)	4 – outside, uncovered storage
Removal procedure	VpCI-414 at 60% for coating removal, let stand 10–15 min, then power wash at 50–300 psi and 115–160 °F (46–71 °C)
Shelf life	1 year
Storage	Original packaging, indoors, out of direct sunlight, 40–100 °F (4–38 °C)
Size	55 Gallon Drum
Shipping weight	470 lb (213 kg)
Availability	In stock
Cortec product number	12300126

Solvent Recycling Systems is an authorized Cortec® distributor. See the full Cortec VpCI line, browse the VpCI product selection guide, or contact us for volume pricing and lead times.