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Architect needs info on metal stair finishing options

2004

I am the project architect for an award-winning hillside residence currently under construction in Pacific Palisades, Calif. In the center of the house, there is a double-back, two-flight stair which is to be fabricated with cold-rolled bent 3/16" plate carbon steel (supported by TS stringers). There has been much debate among my firm, the owner, the contractor, and the steel subcontractor on the appropriate finish for an exposed steel stair. I am attempting to balance wear-and-tear with the look we would like to achieve. I would like input on the following applications:

*Acid wash (muriatic or phosphoric acid) followed with an acrylic clear coat.
*Acid wash with a clear epoxy coating. What coating would be appropriate?
*Darkening patina application with a clear coat.

I most specifically interested in acquiring better information on the pros and cons of the coating options. Any assistance is appreciated.

Thanks,

Jeffrey Adams
architect - Los Angeles, California, USA

Why don't you flame spray copper on to all surfaces and then do a light acid wash to patina the surface. Then, just coat with urethane two part. You did not mention stair treads nor hand rail application. I have done this type of application for decorative/safety on steel stairs both exterior and interior. Works well with the exception of either sand blast or glass bead prior to applying copper. And the finish can be controlled from heavy(course) to fine.

Mr. Steve Fixler
- Westfield, NJ
2004

I just moved from HAWAII and very high end gates, handrails and staircases was my game. I have found out if you use Dupont 25a primer and spray with real copper paint and patina that, then you can use 2 part clear epoxy. It is quick and easy. the real copper paint will patina naturally but it is slower than real copper. If you are trying to match it to something else you can speed it up by a very diluted acid solution. If you need anymore info please let me know.

Lloyd Killingbeck
welding/maching - Boise, Idaho
2004