Breathe easy! No registration or passwords; no maddening pop-up or floating ads :-)

Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Etching primer required for painting standard electro-plated EMT conduit?

April 28, 2012

Q. I've searched the forums and seen lots of confirmation of the need for an etching primer for hot dip galvanized metal. But is an etching primer necessary for painting standard thin wall EMT conduit that has a light electro-galvanized finish? I found a Rustoleum spray paint that advertised itself as a "bare metal primer", but it is not an "etching primer". The application is for some homemade frames for a small solar panel array. The panels have a 25 year lifespan, so I'd like to have the painted conduit last as long as possible. I don't mind repainting or replacing the frames in 10 years, but I'd rather not have to do it more than necessary. Thanks in advance for any advice.

Jason Tomlinson
Homeowner - Franklin, Tennessee, USA

Self-etching primer

(as an Amazon Associate
& eBay Partner, earns from qualifying purchases)

April 30, 2012

A. Hi Jason.

I think the etching primer is a very good idea. Some etching primers are available as spray paint.
if you feel that that is more practical than brushing. If you go the other way, you won't be able to prove me wrong for 10 years :-)


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

May 2, 2012

! Thanks for the tip. I've read several of your informative posts, so I'm not about to go out on a limb against your advice. I'll go the etching primer spray paint route.


Jason Tomlinson
- Franklin, Tennessee, USA

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023, Pine Beach, New Jersey, USA