Vitreous Enamel 316L steelWorks: first step

 

The Echo project began with preparation. Each 3D-printed 316L stainless steel piece, including a miniature armchair, a wedding gown and a guitar, was scrubbed with a soft brush in a mixed solution of borax, dish soap and Simple Green to remove residue from printing. Because 316L has a dense, less porous surface, clean metal is the foundation for everything that follows: the enamel has to grip the steel, not a film of oil or dust. The ground coat and cover coat solutions were mixed at the same time, so the firing schedule at the Chicago Avenue Fire Arts Center could run without interruption.

Testing 316L Stainless Steel for Vitreous Enamel: Process Update

I’m running a set of controlled tests to find out whether 316L stainless steel can reliably take a vitreous enamel coating. If it can, 316L opens the door to future projects, especially outdoor and architectural work, where its corrosion resistance would be a real advantage. If it can’t, I want to learn that now, on small test pieces, rather than on a commissioned work. Here is where things stand.

Why 316L, and why test first

316L is a low-carbon, marine-grade stainless steel. It resists corrosion far better than the mild steel traditionally used for enameling, which makes it attractive for work that has to survive weather, moisture, and time. That same resistance is also the challenge. Stainless steel forms a thin, stable chromium-oxide layer on its surface, and that layer can interfere with how enamel bonds to the metal. Mild steel has a long, well-documented enameling history. Stainless has much less of one. Rather than assume the process will carry over, I’m treating these four pieces as a true test: same preparation, same materials, carefully documented results.

Step one: Surface preparation

Enamel is unforgiving about surface contamination. Any oil, residue, or loose particle left on the metal can cause bubbling, pinholes, or poor adhesion once the piece is fired. I deep-cleaned all four test pieces with a combination of borax cleaner, dish soap, and Simple Green, scrubbing each piece by hand. This took longer than expected. The steel has a slight grit or texture to it, and the fine particles caught in that surface had to be fully worked out. After rinsing, the pieces felt noticeably different to the touch: cleaner, smoother, and free of the slick film they had before. That change in texture is a useful, if informal, sign that the surface is closer to ready.

Step two: Mixing the enamel

I’ve prepared both the ground coat and the cover coat. The ground coat is the first layer applied directly to the metal. Its job is adhesion: it forms the chemical bond between the steel and the glass. The cover coat goes on top and carries the color and final surface. Both were mixed with distilled water rather than tap water. That choice is deliberate. Tap water carries minerals, chlorine, and other dissolved substances that vary from source to source, and those can change how the enamel suspends, flows, and fires. Using distilled water removes one variable from the test, so if a result goes wrong, I can more confidently trace it to the steel or the firing rather than to the water.

Step three: Kiln access and schedule

Today I met with the Chicago Avenue Fire Arts Center (CAFAC) and set up a schedule for both drying and firing. CAFAC offers standard studio rental time, but I asked to extend my access by an additional month and a half. Testing a new metal is not a one-firing process. Each piece will likely need several rounds of application, drying, firing, and evaluation, and some results will only show up after the piece has cooled and been handled. The extended window gives me room to adjust firing times and temperatures, repeat tests that don’t go as planned, and compare outcomes across all four pieces without rushing to conclusions.

What comes next

With the pieces cleaned, the enamel mixed, and kiln time secured, the next phase is application and firing. For each piece, I’ll be documenting:

• how evenly the ground coat goes on and dries
• firing temperature and time
• whether the enamel bonds, cracks, chips, or pulls away from the steel
• how the cover coat performs on top of the ground coat
• surface quality after cooling, including any bubbling, pinholes, or discoloration

The goal is a clear record I can return to, not just a yes-or-no answer. Even a failed test will tell me something specific about what 316L needs, whether that’s a different preparation method, a different ground coat formulation, or a different firing profile. I’ll share results as each round comes out of the kiln.