Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Zinc Primer for interior potable water tanks

Zinc Primer for interior potable water tanks

RE: Zinc Primer for interior potable water tanks

I hope you are speccing NSF-approved coatings only.

RE: Zinc Primer for interior potable water tanks

i tried to feel out the crowd myself a few months ago on this for immersion coatings...
thread332-344253: zinc primers for interior water tanks

My gut feeling is that zinc primer and epoxy primer systems both work fine, all other things being equal. Regardless, there are enough tanks out there for both to say that zinc-epoxy-epoxy and epoxy-epoxy-epoxy are both the "Standard" system you asked about. unless you go down the path of extending coating life with plural-components, the tank will be getting recoated in the next 10-15 yrs anyway.

If you want the same system for multiple manufacturers for bid purposes, pick a 3-coat epoxy system since everyone has it. If there is preference for zinc primers by the owner (i'm going to go on a limb and assume you aren't die-hard entrenched in one or the other), exclude the non-player manufacturers. If there is no preference either way, list all the approved manufacturers and let the contractor choose the system. the owner will likely have a preference to few certain name brands already.

if these are new tanks, look into having the plate metal shop primed except weld heat zones... you'll cut down on surface prep in the field and probably get a better prime.

my $0.02. i hear a lot of opinions about those primers but i just don't see many case studies or hear stories about how well or poorly "that zinc coated tank" is doing.

RE: Zinc Primer for interior potable water tanks

I've specified painting systems for navigation lock gates and dam gates for many years. We always used 2 coats of epoxy for immersion service, and zinc-rich with epoxy and a polyurethane topcoat for splash-zone stuff.

RE: Zinc Primer for interior potable water tanks

I am using a zinc primer for my water tank, and it works very well. But what works for me, might not necessarily work for you. Anyways, good luck.

RE: Zinc Primer for interior potable water tanks

Keep in mind that specifying a "zinc primer" is about as specific as specifying a "concrete bridge"

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close