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Old 02-27-2018, 10:10 PM   #1
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Rust treating floor with paint?

Hi, all. Iím new here, so hoping Iím doing this right. Not sure if this has already been addressed, but Iíve just got all the old sub flooring removed and need to work on treating rust. It was recommended we use jasco prep and prime. However, I notice our floors seem to already have an old layer of white paint. Do I need to strip this before applying a rust treating acid or will it take care of paint? Thanks!
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Old 02-27-2018, 11:21 PM   #2
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I believe most people are using a product called Ospho to treat the rust. I'm not familiar with that product yet.

Clean up the rust with a wire brush or whatever works for you. Get all the scale off, clean the surface a couple times and then treat the rust after it's dry. You don't need to worry about the paint unless it actually has rust under it. An oil base paint is often put over the floor before insulation and flooring.

There are numerous threads here with really good photos showing this exact procedure.
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Old 03-01-2018, 07:39 AM   #3
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Right, you need to strip everything and get down to bare metal. Anything that treats rust is not going to do the whole job for you. You need to wire brush, (or any method you choose) to get as much rust off as you can. Then you can use the chemical....followed by a coating of paint.

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Old 03-01-2018, 10:20 AM   #4
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Originally Posted by tobeamiss View Post
Right, you need to strip everything and get down to bare metal. Anything that treats rust is not going to do the whole job for you. You need to wire brush, (or any method you choose) to get as much rust off as you can. Then you can use the chemical....followed by a coating of paint.

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That is not completely true cleaning the floor to completely clean voids the need for rust converter of any kind. The phosphoric acid needs iron oxide to work correctly. remove loose paint remove scaling rust and treat with converter, if needed treat with second coat if second coat is needed it will be fairly obvious.
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Old 03-02-2018, 03:55 PM   #5
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Originally Posted by Sdmullennix View Post
Hi, all. Iím new here, so hoping Iím doing this right. Not sure if this has already been addressed, but Iíve just got all the old sub flooring removed and need to work on treating rust. It was recommended we use jasco prep and prime. However, I notice our floors seem to already have an old layer of white paint. Do I need to strip this before applying a rust treating acid or will it take care of paint? Thanks!
Do you have a pic of your floor?


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Old 03-03-2018, 10:48 PM   #6
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After we removed our plywood floor, we had a mix of surface rust and old paint. We sanded with 80 grit sand paper then pressure washed the floor. After it completely dried we used a product Corroseal. It turned the old rust black and stopped it. We then painted with a good coat of rustoleum pain. Made a video about the process too.
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Old 03-05-2018, 01:49 PM   #7
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Does anyone know what this piece is under my subfloor? I removed all the wood as well, and have a few rusty holes near the wheel wells, but this has me puzzled... I'm hoping it is not chassis related issues. I can put my hand through it now, but im sure it was once solid.

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Old 03-05-2018, 02:24 PM   #8
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Hey robcat...we meed that pic.
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Old 03-05-2018, 05:09 PM   #9
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https://drive.google.com/open?id=10w...SUNRIcplfIPDRi
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Old 03-05-2018, 05:30 PM   #10
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Here ya go
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File Type: png rust.png (998.9 KB, 31 views)
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