Anyone have much experience painting metals roofs? I have a rather large barn roof that a customer wants us to bid. Also, they have a grain bin as well. I have easy access to a SW store, so that is more than likely what brand I would use. I need some recommended proven products to try. The roof does have a decent amount of rust, so it will need some prep and then probably one coat of primer and two coats of finish. I just figured some of you guys on here have more experience in the industrial area than I do. Residential is my expertise!
If you talk to manufacturers reps, they generally try to over-engineer roof systems due to the beating they take. I have seen people use acrylics over an oil primer, linseed-oil based paint over oil primer, and cheap fibered aluminum coatings. You may see 2-4 years out of these systems. The last roof I was involved in was 2 coats of general purpose epoxy and a finish coat of aliphatic urethane. While it costs probably 5 times as much (minimum), some manufacturers will say it will last 12-15 years.
Out here in farm country we wire brush to remove loose rust and apply Insl-X Rust Arrestor. You can then apply your prefered latex top coat. Yes I have used it on my own tin roof, my neighbors and a 10,000 sq ft comercial job. (we did rusted bolt heads and any rust spots on the metal siding) It works. Here's a link.
Very true bikerboy.I had sw. rep come and look at a metal roof that needed plenty of prep plus renailing in some areas and the price he quoted me just for mats. was alot more than brand new sheeting with a baked on finish?Go figure!
^This I have sprayed thousands of gallons of it, and it holds up well. For the house I may would use something different, but industrial farm I would go with silver brite every time.
I would def talk to a rep about this. But maybe not an SW rep, a PPG rep maybe. Lot of rusty roofs around here. Do you use the waterblasting (pw hooked up to a bucket of sand) method or something fancier to prep it? How do you paint it? Spray or roll?
We use a simple bucket of sharp sand and a 4000 PSI Simpson Water Shotgun. This does a real nice job, very fast and NO dust or chemicals, just water and sand.
We always spray our finishes on metal roofs. Not only is it faster, but you end up with a uniformly applied DFT, and no unsightly brush and roller marks.
If the roof has some amount of rust, then you might really need to apply a primer and some finishing layer to restore the roofing. You might need to apply something about the leakage if there is.
I would go with Pro-Cryl Universal Primer from SW. It is a rust inhibitive and designed for both construction and maintenance applications. It is used as a primer under water based or solvent based high performance top coats. It is priced high but it is a product that will get the job done. I use this product on commercial jobs and i have never onced had to go for a call back as long as you prep rite.:thumbup:
I would go with SW to paint a metal roof. And I would definitely paint with spray and not roll just because, it leaves a nice clean surface, looks way better which makes satisfied customers .
I have experience with metal roof. We did one last year. Scraped the loose paint. PW with degreasser. Scraped some more loose paint. Sprayed devoe devflex (primer+2 coat).
Got a call this year from the client....the paint is peeling again.
I refunded 6k and told her she should sandblast or change the roof. The client was very impressed with my professionnalism.
So, no I dont have any good advice for you. Sorry....
I use a product called Cal-Bar. Used it on a job, covers great and holds up very well. I used Sherwin Williams Kem-Bond oil base primer. Made in Levittown PA, I see you are pretty far from there though.
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