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Cortec EcoLine® 3690 Oil-Based Temporary Coating

Cortec EcoLine® 3690 Oil-Based Temporary Coating

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Introducing EcoLine® 3690, an innovative biobased oil-based temporary coating specially crafted to withstand the harshest marine and high humidity environments.

This cutting-edge product excels in severe conditions.

EcoLine® 3690 has eco-friendly composition, with a remarkable 72% USDA-certified biobased content. This composition is the perfect choice for environmentally conscious consumers. It proudly bears the USDA BioPreferred® Program label. This label is an esteemed recognition of its commitment to sustainability and environmental responsibility.

Moreover, as part of the USDA BioPreferred® Program's Mandatory Federal Purchasing Initiative, it is a preferred choice for government agencies and institutions seeking greener solutions.

EcoLine® 3690 boasts unparalleled multimetal corrosion protection. It can safeguard a wide range of metals from deterioration, even in the most challenging and corrosive marine environments. Its outstanding temperature stability up to 180 °F (82 °C) ensures reliable performance in varying temperature conditions.

A key advantage of EcoLine® 3690 lies in its unique formulation, which leaves behind a non-drying, oily protective film. This film acts as a robust barrier against the elements, offering extended protection to surfaces for prolonged periods.

Unlike conventional coatings, this feature ensures that the protective layer remains intact. Even after long exposure to challenging conditions, Ecoline 3690 provides peace of mind and reduces the need for frequent reapplications.

Packaging and Storage

The EcoLine® 3690 Oil-Based Temporary Coating is offered in various packaging options. These options are pails, liquid totes, bulk quantities and metal drums. Pails are available in 5 gallons while liquid totes, metal drums and bulk quantities come in 55 gallons or 208 litres. For optimal product performance, it is essential to store the coating in its original packaging indoors, away from direct sunlight, within a temperature range of 40-100°F (4-38°C).
Shelf life: 2 years

Preparation and Application - Preparing the Surface

Before applying EcoLine® 3690, ensure that the substrate or metal is entirely free any contaminants. These contaminants may be dirt, grease, drawing compounds, fingerprints, oil, dirt, and rust inhibitors, approved by Cortec®. They may hinder adhesion.
For painted surfaces, use the SSPC-SP1 preparation as the minimum requirement. In applying on exposed metals, Cortec® advises to sue the NACE #3 or SSPC-SP6 preparation. It is prudent to consult the technical service of Cortec and conduct a system adhesion test before proceeding with the full-scale application.


To achieve a smooth viscosity, vigorously agitate EcoLine® 3690 with the use of a cylindrical mixer or may be hand-held drill mixer. If you have any other similar equipment or method, you can also use it. This step ensures proper blending of the product. EcoLine® 3690 offers versatility in application. You can use brushing, spraying, rolling, or dipping depending on the specific requirements of the project.

Setting Up Equipment - For Conventional or HVLP Spray:

  • Nozzle Size: 0.02 up to 0.11" (0.5 up to 2.8 mm) *adjustable based on fluidity and pressures
  • Air Pressure: between 45 and 55 psi
  • Fluid Pressure: maximum of 10 psi
  • Use a 0.95 cm or ⅜-inch I.D. fluid hose, up to a maximum 50 feet or 15.2 m in length. Alternatively, you can use a ¼ inch or 0.64 cm I.D. fluid hose but adjust pressure accordingly. The spray gun and pot should always have multiple regulations and remain at the same elevation.

For Air-Assisted Airless/Airless:

  • Nozzle Size: 0.015 up to 0.035” (or between 0.38 and 0.89 mm) *adjustable based on viscosity and pressures
  • Pressure: between 1800 and 2500 psi
  • Ensure the hose is a minimum of ⅜” (0.95 cm) I.D., but you can use a whip end section with ¼ inches or 0.64 cm in thickness for easier application. We suggest a maximum 100 feet or 30.5 m in hose length.


After use, clean tools and equipment immediately with n-butyl acetate while the coating is damp. For removing EcoLine® 3690 from a metal surface, employ a VpCI®-41x series alkaline cleaner degreaser. Always follow the manufacturer’s safety precautions and recommendations when working with any solvent. 

Product Specifications (.PDF)

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