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Old 04-26-2017, 10:00 PM   #1
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To treat or not to treat (new galv steel)

Here's an interesting one for you guys...

We're replacing the entire metal floor. The last few days have been spent scraping up all the old adhesive that kept the original steel down.

So we have new steel that we plan on putting down in the next couple days.

The question is, should we put rustoleum down or just let it go?

And before you say to just put the paint down, new galvanized steel can be a real pain as far as getting paint to actually stick for long periods (think ~5 years). I have no way of knowing how long its been weathered.

What would you do?

Also, there will be undercoating going on from below.
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Old 04-26-2017, 10:16 PM   #2
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You cannot get paint to adhere to galvanized without etching it first. Properly etched and painted, it will last much longer than unpainted.

PS...there are also "Self Etching Primers" out there.
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Old 04-26-2017, 10:32 PM   #3
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Use Ospho to etch galvanized steel, then its paintable.
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Old 04-26-2017, 10:49 PM   #4
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****, all you need to do is etch it? Okay then, I stand corrected! Thanks guys.
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Old 04-26-2017, 11:09 PM   #5
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Does muratic acid work for that? I know they use it on unpainted metal roofing before they paint it.
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Old 04-27-2017, 05:29 AM   #6
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Originally Posted by Robin97396 View Post
Does muratic acid work for that? I know they use it on unpainted metal roofing before they paint it.
I'm sure it would, but its real nasty stuff. Especially inside a closed area.
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Old 04-27-2017, 08:03 AM   #7
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I'm pretty sure that muriatic acid should NOT be used on anything galvanized. It will strip the zinc off completely.
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Old 04-27-2017, 09:23 AM   #8
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When someone builds a big barn they often wash the metal with muratic acid before painting. It's readily available at any pool supply store.

I've never used it myself. That is what people used before there were all these etching paints and stuff.
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Old 04-27-2017, 09:39 AM   #9
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Why not go stainless?
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Old 04-27-2017, 09:52 AM   #10
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probably because galv steel is half the cost of SS... and I'm guessing they're not made of money...
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