×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!

*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

Rust Conversion/Protection

Rust Conversion/Protection

Rust Conversion/Protection

(OP)
I have a large house trailer that has a sheet metal roof that has never been coated before.  For the past 20 years the trailer was covered but is now exposed (now a camp in a saltwater enviroment). I've looked into some products but you can't alway believe what you read so I am looking for some advice.  I was looking into some of these products:
-Rust Bullet
-Rust Converter by Duluth Trading
-Rust Doctor
-Zero Rust
-Por 15

Any thoughts on these or any other products?

Stephen E. Motichek
Project Consulting Services, Inc.

RE: Rust Conversion/Protection

My employer makes a version of this class of product.

It resembles a very acidic topcoat that changes the reaction of disimilar metals (oxidation) into a cationic and anionic reaction.  It will indeed stop the rusting, and even convert that rust into the coating itself.

I am not familiar with some of the products you listed above, but I'd be willing to bet all of them produce a black colored film when dry.  That color is a result the carbonic byproduct of the reaction.  (Black probably isn't the best color to be painting a roof, but I could be mistaken in your application...)

I will tell you this- I've never heard of a customer that has ever purchased this class of product from my company ever being extremely thrilled with the result it offered over a similar corrosion inhibiting primer and white (for solar shielding) alykd based topcoat system.

It doesn't sound like you have a large amount of rust to deal with just yet; why not just prime and paint it?  If has rusted, I'd just as well be prepared to remove it, rather than trying this exotic solution for such a large area as a roof.

Also- you said the roof was previously uncoated.  Does this extend to the galvaniziation of the steel?  If the steel was previously galvanized, it could impact you primer selection greatly.

Lastly- Unless you are deadset on an oilbased system, I'd prime and then topcoat with a latex based elastomeric product, which is a cheaper, easier to clean, better for the environment, and overall superior roof coating.

Let me know which direction you go with this project!  Hope this helps!


Rhodie

RE: Rust Conversion/Protection

(OP)
Hey Rhodie,

Thanks for the response. Your right, just about all of products I listed turn into a black film.  Most of them sell for about $35-50/gal. and require a topcoat due to the exposure to the elements.  The one Rust-Bullet is silvery/gray when applied, stays that way and doesn't need a topcoat but it is in the range of a $100/gal.

The whole roof is rusted pretty bad but it doesn't have any holes or pits...yet.  Can't tell if it was galvanized or not. We figure we'll have to replace it some time or more than likely build a roof over it and create some additional rooms.

The roof looks like something needs to be done pretty soon. We're just looking buy some time with a coating versus building a covering.


Stephen E. Motichek
Project Consulting Services, Inc.

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! Already a Member? Login


Resources

Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. Download Now

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