Where the
world gathers for metal finishing
Q&As since 1989


-----

Powder coating cast iron sink

I have gone thru a number of websites for detailed info and have yet to get some specifics. We have a antique farmers sink that has been neglected and wish to use it in a remodel. There a number of areas on it that have large amounts of rust (drain, over spill and around the faucet holes). It has been suggested, by a plumbing shop, that powder coating would be a viable alternative to repairing the damaged areas (which is generally a epoxy color matching the enamel). I have seen these patches flake off. Given this, some input would be appreciated. What concerns me is will powder coating withstand the use a kitchen sink under goes? How easy is it to scratch? Are there any adverse affects the powder coating shows around water?

Robert greer
home remodeler - Sacramento, California
July 31, 2009

---

September 6, 2009

Powder coating is a good choice, but it comes with some warnings.

First off, this is not a good candidate, powder coatings (as far as I know) are not normally used in applications where they are going to see a lot of moisture. Since the coating is inert if water gets under there and starts to rust you aren't going to know until it's too late. I would suggest doing porcelain coating on the inner surface that is going to be in contact with the water all the time.
Without pictures I can't really suggest more.
If possible post some pictures of it and we can tell you more.

Marc Banks
Blacksmith - Boone, North Carolina

I must disagree with the caveat of water exposure. The water distribution industry commonly uses powder coat paint on valves, hydrants, etc. that are in constant contact with water. Of more concern for this application is the integrity of the substrate material so that he can can good adhesion. Painting over a rusted surface is not advisable.

Walter Evans
Water Distribution - Chattanooga, Tennessee, USA
January 31, 2012