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Insta-Blak SS-370 GEL

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Insta-Blak SS-370 GEL is an instant-acting swab-on blackening solution that's ideal for vertical surfaces, architectural applications, and smooth, drip-free black finishes. One gallon can blacken approximately 100 sq. ft. of stainless steel surfaces.

Learn about EPi's trial kit.

Samples available to purchase - CALL #262-786-9330.

PLEASE NOTE: Orders ship within 3 business days.

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How to Use Insta-Blak SS-370 GEL

Use Insta-Blak SS-370 GEL to give stainless steel parts, such as architectural surfaces and vertical surfaces, rich grey-black finishes that are free of smut, drips, and runs.

Use Insta-Blak SS-370 GEL to:
  • Produce a dark grey-black finish in 1–5 minutes
  • Blacken architectural surfaces such as railings and panels
  • Perform touchups or blacken prototype parts
  • Achieve smooth finishes with no drips or runs
  • Produce no dimensional or structural changes in the metal
  • Meet AMS 2484 standards

Getting Started

EPi offers starter kits for small projects and product testing. Learn more about what is included in the trial kit.

The Blackening Process: Insta-Blak SS-370 GEL

For the longest-lasting, deepest, and cleanest black finishes, we recommend the following blackening process. Please read all safety data sheets and technical data sheets prior to beginning a project.

1. Clean

Soils such as cutting oils, coolants, lubricants, and rust inhibitors must be removed from the metal workpiece. Soils can inhibit the blackening process and negatively affect coating adhesion and appearance. Thoroughly clean and degrease the parts prior to beginning the blackening process.

Recommended Cleaning Products:
  • E-Kleen 163 works best for hand applications. It's nonhazardous and works at room temperature.

2. Rinse

After cleaning the metal parts, rinse them in cold, overflowing tap water; it’s necessary to rinse the parts to remove residual cleaning solution. Parts carrying over un-rinsed film of alkaline cleaning solution would quickly contaminate the subsequent chemicals in use, resulting in a spotty or non-adherent black finish. 

Immerse the parts to be blackened for 30–60 seconds.

3. Blacken

Apply Insta-Blak SS-370 GEL generously and at full strength with a cotton swab, sponge, or brush using a light rubbing action. Ensure the solution is smoothly and evenly applied. Continue light rubbing action for 1–10 minutes. The longer the metal is in contact with the solution, the deeper the black finish.

 If Insta-Blak SS-370 GEL isn't quite what you’re looking for, consider these similar products:

4. Rinse

Rinse in cold, overflowing tap water for 30–60 seconds to remove residual blackening solution and ensure sealant will not be contaminated.

5. Seal

Seal the black-oxide finish by immersing the parts in a corrosion-inhibiting and rust-preventative solution. E-Tec corrosion inhibitors are formulated to rapidly displace the residual acidic solution from the preceding rinse and produce long-term corrosion protection. As the E-Tec is absorbed, it enhances the depth of black, which may take several hours.

Recommended Sealing Products:
  • E-Tec 504 is a solvent-based, dry-to-touch oil formula.
  • E-Tec 515 is a water-soluble oil that contains no VOCs. It's the most economical method for achieving corrosion protection.
  • E-Tec 522 is a water-based satin wax for lubrication properties. It provides a dry-to-touch finish.