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  #1  
Old 08-08-2006, 07:43 PM
pricer pricer is offline
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Default Painting Galvanized Steel

Anybody ever used copper sulfate, in a powdered form, mixed with water to treat galvanized sheet metal prior to painting?

What are some old and/or new ways to treat galvanized for painting? The one I have always heard about was vinegar. I have tested this with mixed results. Zinc chromate primer is another method I have tried with success. It’s almost worth using Galvanneal.

Anybody have any tricks of the trade up their sleeve?
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Old 08-08-2006, 08:23 PM
Tets11 Tets11 is offline
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I've tried rubbing it with Muriatic Acid on the metal, rinsing it off and then painting. Just tried it, not sure how long or how well it'll work though.
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Old 08-08-2006, 08:28 PM
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I have thought of that too. Did you dilute the acid before applying to the metal? On a large scale, I bet it could get very messy and would have to be done in a well ventilated area. I saw a guy one time leave a small jar of muratic acid open in the shop overnight and the bar joist above it was rusty by morning.
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Old 08-08-2006, 08:35 PM
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I didn't dilute it. Not sure if I should have?????
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Old 08-09-2006, 05:44 AM
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I have painted galvanized with latex paint with great success. All I did was just make sure it was clean. The latex paint has something in it that will make it adhere very well. Keep in mind it takes quite awhile for the paint to fully cure. The latex will expand and contract with the metal also. I have some columns on my front porch of my house that I wrapped in galvanize and then painted......15 yrs. later it looks the same. I wish I could say the same for the wood siding !! Anyway back to the preping......they do make a product called GalvPrep and it is a diluted muratic acid solution. If you are going to use lacquer or enamel paint you will need to prep it.
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Old 08-10-2006, 05:06 AM
tnbndr tnbndr is offline
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There is also a product out there that I have used successfully in the past called GalvGrip. It is actually a primer that goes on a light translucent blue in color and sticks to the galvanized or any other metal. It remains slightly tacky and then you just paint over it. It works great. I have used it on metal doors, gutters, flashing, etc. I'll have to see if I can find a can with the manufacturers name and will follow up.
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Old 08-12-2006, 04:15 PM
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I've used Jasco metal prep with pretty good results. I can't remember if we used to get it at Lowes or the local paint supply house. http://www.jasco-help.com/products/prod_mg.htm
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Old 08-12-2006, 09:15 PM
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[quote="LeadHead"]IThanks for all of the tips. I have recently used a product called Ospho, it turns rusty metal black like one of the products mentioned in the link. I will have to re-read the bottle to see if it will work for painting galv.
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Old 08-15-2006, 08:39 PM
pricerjr pricerjr is offline
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well, in the old days we would use laquer thinner. That did the trick...guess that don't work anymore. lol =)
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Old 08-15-2006, 09:11 PM
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Hey pricerjr, nice to hear from you again...how you doing?
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