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topic 35232

Clear coat sealer for cast iron

Some clearcoating solutions (adv.)    g j nikolas banner   everbrite banner  


Q. I have an outdoor fountain made of cast iron. I need a clear coat sealer to keep it from rusting. Any suggestions? Thanks.

Steve Johnson
- Columbia, South Carolina


Q. Would like to know if you found anything. I, too, have a cast iron bird bath that I need some sort of sealer to stop it from rusting. HELP...PLEASE....SOMEONE.

Kathleen Leffew
- North Carolina

Contemporary Patination
from Abe Books



A. According to a metal sculpture workshop I took in preservation of metal/bronze items, the best coating is marine varnish with a UV additive. Even with that, the maintenance on the item should be every 6 months for upkeep. There is a book by Ron Young "Contemporary Patinization" that explains the care of outdoor fountains from rust and bird poop =>

"You must put a stop to rust..."

alicia moreno
Alicia Moreno
   "La Kromadora"

Escondido, San Diego No., California

February 27, 2008

A. I was looking for an answer to this and have found on other sites a reference to a product called POR-15 [linked by editor to product info at Amazon]; I have not tried it yet, but will give it a shot. I just thought I'd share.

It is ridiculously expensive though :-(

Robert Champney
- Orlando, Florida USA

Clear lacquer for cast iron bathtub

August 21, 2013

Q. Can anyone one help, we manufacture cast iron baths and some of the baths are polished on the outside of the bath and are lacquered. The problem we have is that some eventually start to rust under the lacquer, this can happen prior to fitting (thank goodness) so somehow we are getting I guess moisture trapped under the lacquer. So my question is does anyone have experience in this and have a process that can eliminate such problems.

Steve Thompson
- Lincolnshire UK

September 3, 2013

A. The full process details would have been more helpful, but try heating the cast iron bathtub at 120 degrees C for about 30 minutes Effective Metal Temperature. That will drive the moisture out from the porosity inherent in the casting. All to cool before you carry out the next step but do no leave it long without the protective coating. All the best.

Gurvin Singh
Coatec India
supporting advertiser
Mohali, Punjab, India
coatec india

September 3, 2013

A. Gurvin has a great idea. Another way is to use multiple steps, similar to the steps you are using now but to add a few additional steps. For example, you may need to use more than one coat and not just go straight to the lacquer, instead use a primer prior to final top coat. You may find it's best to use a color that mimics the original coloring or go with something more common like black.

blake kneedler
Blake Kneedler
Feather Hollow Eng.
Stockton, California

September 5, 2013

thumbs up signHi and many thanks for the responses, much appreciated. I will update once we have come to a resolved state of play.

Stephen Thomspson
- Lincolnshire, UK

February 17, 2015

I am also looking for a finish to stand the elements. This company claims to have a product specifically for fountains called Permalac 2k

Shamus Quinly
- Kansas City, Missouri USA

February 26, 2018

Q. I have a school Bell from 1886 ... what is the best clear coating product to keep it from rusting?

Barbara Kathryn Barnes
- Kenner, Louisiana

March 2018

A. Hi Barbara. I'm surprised that it's made out of cast iron rather than brass or bronze. But I think the thinner single-component coatings like Everbrite [a supporting advertiser] are best towards not distorting the peal of a bell than heavier two-component coatings. If it actually is brass or bronze you might consider brass lacquer [linked by editor to product info at Amazon].


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Ted Mooney, P.E. RET
Pine Beach, New Jersey
Striving to live "Aloha"

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