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Painting Galvenized steel siding?

S

shawnm

Member
Has anyone sucessfully painted galvenized steel? I have two buildings that I'd like to change their color to a light gray. One building is 22 yrs old while the second is 6 yrs old.

To re-sheet the builings it will cost in excess of $25,000.00. I wouldnt consider painting this but I was unknowingly sold lower grade steel on the newer building. It is getting blotchy and is a disappointment to look at.
 
You should place this on the Paint forum to get more responses. I would also ask a painting contractor for his recommendations. The surface probably needs a good cleaning. Zinc Chromate may be a good primer or an acid primer. Hal
 
(quoted from post at 11:08:03 09/11/12) Has anyone sucessfully painted galvenized steel? I have two buildings that I'd like to change their color to a light gray. One building is 22 yrs old while the second is 6 yrs old.

To re-sheet the builings it will cost in excess of $25,000.00. I wouldnt consider painting this but I was unknowingly sold lower grade steel on the newer building. It is getting blotchy and is a disappointment to look at.
Click to expand...

Get some Phosphoric acid, and a pump sprayer or two, and spray it down on a cool day. give it 24hrs to dry and then paint directly over it. The Phos. acid will etch itself to the existing surface, kill any rust and seal the surface, and act as a primer for any type paint.
 
My first factory building was galvanized steel. When I added a 100 X 100 warehouse which was pre colored beige. We painted the galvanized steel with a primer meant for galvanized steel. We then painted it to match the warehouse. That was about 19 years back. It has a slight fade but never pealed.
 
About twenty years ago I painted my wooden barn with a white latex, no primer. About half of the north wall is covered with old galvanized roofing that I screwed straight onto the side of the barn to tighten up some holes in the wall. Anyway, when I painted the barn, with a sprayer, I shot the galvanized roofing tin on the north wall too. There was no etching or surface prep of any kind.Now twenty years later the paint is pretty much gone from the wooden part of the barn but it's still looking pretty good on the galvanized tin. Go figure! I have no idea what brand of paint I used. I'm certainly not a paint expert and this might have just been an abnormal situation. Maybe being on the north wall helped the paint?Jim
 
the old way was to clean galv metal with white vinegar before painting.probably better ways now but this still works.
 
I have Painted galvanized buildings as well as steel siding that had paint worn off plus of course wood siding.
If the galvanized is weathered but not rusty any solid color latex will work fine. No prep work is needed unless it is dirty of course.
Now if the galvanized has any rust you need to spray it with Rusty Iron Primer made by Rustoleum as that will stop the rust.
If the galvanizing is rusty I spray it with Rusty Iron Primer then let it dry a week before the second coat. After a week I spray any good Latex topcoat. The sun bakes the latex and you end up with a long lasting job.
The only other suggestion is to make sure you allow enough time for it to dry before evening dew or it will wash off.
I've been doing this for customers for 15 years and the first buildings look good yet.
If you spray with aluminum it may last 5 years but thats because the coat is so thin. Latex is much thicker and as I said it will bake on with the sun.
 
when i paint a galv steel building i spray with TSP
solution and pressure wash. The spray with an
airless sprayer. I usually use the latex barn and
fence paint from the box stores.

-paul
 
Good to know it's been holding for many years for some people.

My local contractors aren't supportive of painting steel siding at all.
 
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