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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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What is paintlok?
Q. I have ductwork for a commercial job coming with a "Paint Lock" finish coat. I understand from this page it's meant for paint. I'm planning on using dryfall to lower the cost. I understand I don't need to etch it but is wiping it for oil with a cleaner still required? Newbie question here...thanks everyone!
Robert Morales- San Juan Capistrano, California
March 3, 2021
A. Hi Robert. If a lack of cleanliness is obvious, it certainly needs to be cleaned. If it truly looks pristine, then it's a judgement call but, personal opinion, I'd probably risk it since corrosion is not an issue, only poor adhesion ... and insufficient adhesion for this application doesn't sound likely if there is no visible dirt, grease, oil, or fingerprints. If we were talking about a car rather than ductwork, that would be very different of course.
Dryfall paint sounds fine for the application.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
March 2021
⇩ Related postings, oldest first ⇩
Q. Hello,
This is my first time that I use this website, and I want to explain my situation. Yesterday I received a RFQ of one of my main clients, and there are few parts that needs a paintlok process. In order to keep the project I need to be able to treat those parts. I don't have any idea of what is a paintlok process, do anyone have a clue?
Thanks a lot for your time!
Project manager of a powder coating line - Monterrey, Nuevo Leon, Mexico
2007
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A. Paintlok is galvanneal. It's also called other things as you will soon find out. :-)  Sheldon Taylor supply chain electronics Wake Forest, North Carolina 2007 A. Paintlok* is electrogalvanized + phosphatized sheet steel. The coating is very thin, withstands most forming operations, has a dull gray matte appearance and is intended to be painted. ASTM A591/A591M,
'Standard Specification for Steel Sheet, Electrolytic Zinc-Coated, for Light Coating Weight [Mass] Applications,' with supplemental phosphatizing specified, can be used to order the material. Possibly, Paintlok corresponds to the A591M 'Intermediate' thickness of 0.84 microns (6 g/m2) zinc per side. Weirzin Bonderized is ~equivalent. - Goleta, California 
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from. 2007 |
Q. A previous answer describes that it "is intended to be painted"
My question is, if I were to paint on this material, do I need to prime it first, or can I paint directly on this dull gray surface?
I'll be using one shot enamel, the sign will be outdoors, for 6 months in Southern California.
My client purchased this product and wants us to paint on it. Not my first choice but I can work with it.
Any help greatly appreciated!
Sign Painter - Los Angeles, California USA
October 27, 2012
A. Hi, Bear. I think a phosphatized finish will accept paint very well, and it sounds like the trademark was deliberately selected to imply that paint will adhere well. But it's still a truism that two coats are better than one, due to greater thickness, reduced porosity, and less chance of missed spots.
Good luck.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
October 28, 2012
I've started the job and 1 shot seems to be holding well.
Thank you for the reply.
- Los Angeles, California, USA
November 4, 2012
January 27, 2014
A. Galvannealed (which PaintLok is a type of, specifically ASTM A653 Coating A60) is very similar to Galvanized except it uses a zinc-iron alloy rather than just zinc. Both are per ASTM A653 (which has replaced the previously mentioned ASTM A591/A591M), with galvannealed being a coating designation of A or ZF and galvanized a G or Z designation.
Electro-Galvanized (ASTM A879) is another variant of corrosion resistant steel sheet.
Both Galvannealed and Electro-Galvanized are readily formable and weldable with no need to remove the coating. Both accept paint well.
Normal Galvanized (astmaASTM A653 any coating G or Z) does not accept paint well.
Some commercial references:
www.hbsteel.com/galvanized-steel-sheets.html
www.industrialmetalsupply.com/Metal-Resources/Metal-Glossary
~Dan
- Chandler, Arizona, USA
Q. I am a sheet metal worker. My brother asked if I could use Paintlok galvanised to top an island he is building for his wife. I am nervous about this as he does not want to coat it. Can this product be used uncoated for a counter top? Thanks.
mike cowan- garden Idaho USA
April 2, 2015
A. Hi. I'd say no. It's not meant to be, and it's probably not the kind of food-safe finish you would want on a kitchen counter.
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Q. I am an mural artist used to painting on walls. My client (a librarian) wants me to paint the (wood) risers of her exterior front stairway to resemble a stack of books. We have decided the best way to do this is to paint sheets of 20 guage sheets of stainless steel (cut to size), one per stair and then adhere them to the risers.
I plan to use PaintLok steel, and then it sounds like I should seal each piece. What product do you suggest?
Then for the paint, I was planning to use exterior grade latex. I am worried about top coating it with something else to finish - I don't want it to yellow over time or appear too shiny. But will it stand up over time without it? How many years should she expect the work to last?
Then last but not least, I am planning to use liquid nail to glue the sheets in place.
Does this all sound like a good plan? Any help is much appreciated!
Muralist/ Mosaic Artist - Napa, California USA
August 15, 2016
Powder Coating of PaintLok steel
Q. Hello,
I was reading this thread and had a question to add of my own.
I run a Powder Coating Department and we run across some issues when applying powder to Paintlok. I searched the web to find answers to why we are having this issue. Please help!
thank you,
- Chino, California, United States
January 30, 2017
March 26, 2017
A. Hi Val,
What issues are you having? Be sure the parts are clean, dry and oil free! Powder coating does fine on Paintlok in most cases.
Blake Kneedler
Feather Hollow Eng. - Stockton, California
Q. Is it necessary to wash paintlok prior to powder coating?
We powder coat CRS in various gauges. Parts cleaning is always a constraint. We use a self made hot water mixture with zirconium and it works well, but we were told Paintlok does not require cleaning, so we can take it from the laser direct to the powder coat booth. Is that correct?
- Pacific Missouri
December 10, 2020
A. Hi Ron. Reputedly, the galvannealed finish of "Paintlok" does not need phosphatizing pretreatment. But to say it doesn't need cleaning could be a stretch: anything that isn't clean needs cleaning, and unless you're sure the product is fresh from the mill and untouched except by properly gloved operators, that's questionable -- as you can see from the previous question :-)
A second issue is that we should really reference material in terms of accepted specifications like specific grades per ASTM A653 rather than a trademark from 75 years ago because we can run into a similar situation as we would in trying to quantify the adhesion or tensile strength of "scotch tape". When the two different spellings 'paintloc' & 'paintlok' are used interchangeably throughout an industry, it's evidence that we're really not talking about the trademarked product anymore but slang, and it isn't possible to demand that it comply with our expectations.
A third issue is that I unfortunately don't know what you mean by "the laser". If you are cutting steel sheets/plates with a laser and doing no pretreatment on the raw edges, that can certainly introduce problems.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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