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Old 04-13-2012, 04:45 PM   #1
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Default Rusted Crossmembers

So I'm quoting a hockeyrink/rodeo barn that hasn't been painted for 15 years.

They want all the beams and cross members painted (which I'm guessing weren't galvanized). Only problem is they weren't properly treated prior to the initial coats being applied. Then without any zinc primer or anything they were just sprayed with a coat of UFA barn paint.

So now as you can see there is rust everywhere perking up through the paint. Now I know the proper way is just to completely strip them and remove all rust, which I explained to them but they don't want to pay the astronomical cost for that.

So I'm looking for advice of a different avenue. Is there some type of rust inhibitor that would work for an extended period or am I just fooling myself?
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Old 04-13-2012, 05:05 PM   #2
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Talk them into spraying them all black, then the rust will never show.
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Old 04-13-2012, 05:15 PM   #3
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Well I found this stuff called Corroseal, might use that. http://www.corroseal.com/


Converts rust into magnetite. Anyone used this stuff?
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Old 04-13-2012, 05:45 PM   #4
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Taking into account the environment and criticality of the structure and coating needs:

What it's not:
-It will not be immersed
-It is not exposed to exterior weather conditions
-It does not require NSF approved products
-It is not in direct contact with chemicals
-It will not be exposed to impact

What it is:
-It provides structural support
-It requires esthetic value
-It's of significant quantity (material considerations)
-Requires unconventional access (may need a lift or rolling stage)
-Because it's interior it may require ventilation if solvent materials are used

Unknowns:
-Budget(may prohibit the use of specialized prep equipment and industrial epoxy coating systems)

With the above thumbnail analysis, I'd say use the Corroseal and finish with a quality DTM (Two coats if in the budget)

Disclaimer: This analysis is provided by an arm chair billygoat with no skin in the game. Good luck!

Last edited by CApainter; 04-13-2012 at 05:47 PM..
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Old 04-13-2012, 06:25 PM   #5
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Quote:
Originally Posted by CApainter View Post

Disclaimer: This analysis is provided by an arm chair billygoat with no skin in the game. Good luck!
That is brilliant. Thanks for the hearty chuckle!
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Old 04-13-2012, 06:39 PM   #6
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Epoxy Ester dryfall. Uni-Grip or Coronado. Otherwise follow CA Painter or two coats of alkyd DTM or Rust Convertor Primer and one DTM. SSPC-SP-3 or 11. So many options. Budget?
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Old 04-13-2012, 08:40 PM   #7
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I really am a painting nerd or at least a forum groupie when on the way home from work I was thinking of this thread and realized I didn't include the cause of the coating failure.

Existing Coating Failure:

-Thin application of waterbase paint (as Sterling suggested)
-Moisture from humidity caused by water evaporation from the skating rink

Solution:
If ventilation condition are not improved moisture will continue to develop on the support beams. If ventilation engineering is not possible, a barrier coating will need to be considered to prevent moisture permeation.

Note: Again, given the enviroment and the unknown budget I still think Sterlings approach is still adequate.
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Old 04-13-2012, 09:01 PM   #8
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Why people insist on painting structural steel with any latex product baffles me.
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Old 04-14-2012, 01:30 AM   #9
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Quote:
Originally Posted by SterlingPainting View Post
So I'm quoting a hockeyrink/rodeo barn that hasn't been painted for 15 years.

They want all the beams and cross members painted (which I'm guessing weren't galvanized). Only problem is they weren't properly treated prior to the initial coats being applied. Then without any zinc primer or anything they were just sprayed with a coat of UFA barn paint.

So now as you can see there is rust everywhere perking up through the paint. Now I know the proper way is just to completely strip them and remove all rust, which I explained to them but they don't want to pay the astronomical cost for that.

So I'm looking for advice of a different avenue. Is there some type of rust inhibitor that would work for an extended period or am I just fooling myself?
No help to you whatsoever as I am certainly not experienced enough but just wanna say "Hi neighbour you are about 50 mins south of me" what are the chances of that (I even noticed the Stettler GM banner on the back of the building )
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Old 04-14-2012, 07:08 PM   #10
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Quote:
Originally Posted by Oden View Post
Why people insist on painting structural steel with any latex product baffles me.

If it's properly treated treated I don't see the problem. Especially seeing as this stuff is up in the air away from human hands for the most part. Waterbase has come a long long way.
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Old 04-14-2012, 08:10 PM   #11
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i'll add a little something to consider too though may be way off the mark but just thinking out loud

If it's also used as a rodeo arena you might want to check that they don't spray chemical insect repellant on it. I have no idea if this will affect the finish in time - and mostly likely not as you say given the leaps made in both finshes and pest control - but it's something to think about and maybe ask the commitee if they have anyone come and do this for them.

(Most common one I believe is called Tempo)
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Old 04-14-2012, 08:56 PM   #12
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Try using Rustoleum I have used this on lintels (not beans) on the exterior with no problems
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