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Old 08-02-2017, 08:44 AM   #1
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What to do after OSPHO

I mopped the floor with ospho after using orange degreaser to remove the adhesive residue, and now I have a white mess. The plan was to spray with the hose but it's not all coming off. Anyone have a suggestion of what to do after a 24 hour soak of ospho? I want good paint adhesion.

Also I was planning to acetone with a maroon scotch Brite pad would it be best to do this after the Ospho?

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Old 08-02-2017, 08:46 AM   #2
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I mopped the floor with ospho after using orange degreaser to remove the adhesive residue, and now I have a white mess. The plan was to spray with the hose but it's not all coming off. Anyone have a suggestion of what to do after a 24 hour soak of ospho? I want good paint adhesion.

Also I was planning to acetone with a maroon scotch Brite pad would it be best to do this after the Ospho?

Wire brush anything that's loose, rinse it off, and paint it.
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Old 08-02-2017, 09:02 AM   #3
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Wire brush anything that's loose, rinse it off, and paint it.
So I bought all these scotch Brite pads to marr the surface. Should I have done this before ospho?
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Old 08-02-2017, 09:11 AM   #4
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Seems to me that if you are using ospho to treat the rust, the surface is already roughed up. I don't think you need the pads to scuff the floor. Like ECB said, wire brush off all the loose stuff, rinse it off, let it dry, prime and paint. And then cover up your nice paint job with plywood subflooring
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Old 08-02-2017, 09:15 AM   #5
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Seems to me that if you are using ospho to treat the rust, the surface is already roughed up. I don't think you need the pads to scuff the floor. Like ECB said, wire brush off all the loose stuff, rinse it off, let it dry, prime and paint. And then cover up your nice paint job with plywood subflooring
Precisely!
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Old 08-02-2017, 09:18 AM   #6
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Thanks I tend to over think things and just wanted some feedback.
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Old 08-02-2017, 09:22 AM   #7
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I didn't wash mine off. I swept up real good and then painted over it with rustoleum metal paint primer. Now I'll be applying a regular coat of paint....cheap old Glidden as a matter of fact because I already used the good stuff on the bare metal.

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Old 08-02-2017, 11:46 AM   #8
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It is a better practice to rinse off the ospho and dry the panels before painting. The ospho reacts chemically with rust and is for the most part neutralized. Ospho does not react to any extent with paint and so is still quite acidic even though dry.
For best paint adhesion you need to have a chemically inactive surface. etching primers would be an exception as they are themselves chemically reactive. Jack
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Old 08-05-2017, 06:26 PM   #9
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It is a better practice to rinse off the ospho and dry the panels before painting. The ospho reacts chemically with rust and is for the most part neutralized. Ospho does not react to any extent with paint and so is still quite acidic even though dry.
For best paint adhesion you need to have a chemically inactive surface. etching primers would be an exception as they are themselves chemically reactive. Jack
x2. Sucks, but gotta rinse. Rent a rug doctor /wetvac or something to suck up the h2O.

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Old 08-05-2017, 06:44 PM   #10
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If your bus is stipped inside water won't really hurt anything. don't go crazy with it, just a quick rinse will neutralize it pretty well.
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