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Old 03-13-2017, 01:45 PM   #1
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Best Remedy for Rust?

Ok, so the seats are out and the subfloor as well, so we're preparing to build up the inside. I have found a few spots of rust that are deep, most of it is in pretty good shape.

I was thinking of painting the floor before building it up as a moisture barrier as well to inhibit any further rust. Does anyone have any good solutions to take care of this, to ensure that it is as long lasting as possible?
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Old 03-13-2017, 01:52 PM   #2
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Originally Posted by retrogeek42 View Post
Ok, so the seats are out and the subfloor as well, so we're preparing to build up the inside. I have found a few spots of rust that are deep, most of it is in pretty good shape.

I was thinking of painting the floor before building it up as a moisture barrier as well to inhibit any further rust. Does anyone have any good solutions to take care of this, to ensure that it is as long lasting as possible?
The consensus is to take care of heavy rust mechanically, patch any holes/voids, then treat with a rust converter (such as ospho) then paint with a rust inhibitive paint.

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Old 03-13-2017, 01:59 PM   #3
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Originally Posted by Njsurf73 View Post
The consensus is to take care of heavy rust mechanically, patch any holes/voids, then treat with a rust converter (such as ospho) then paint with a rust inhibitive paint.

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Says it all.
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Old 03-14-2017, 06:35 AM   #4
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I use this stuff for rust including the worst motorcycle gas tanks. Available at Home Depot.

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Old 03-14-2017, 06:37 AM   #5
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Yup that stuff is same as ospho.
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Old 03-16-2017, 03:06 AM   #6
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I saw it and wondered if I should get it and now I think I will. I was impressed when I read the label. I like that it etches the metal. Should make lighter work of removing the rust. I got one floor board up at the front of my bus and found alot of rust....I'm using sanding discs like they're going out of style and doing pretty good at it too but using this when I'm done I think will be awesome because the rust made the metal porous and leaves tiny dots of rust....the etching will work fantastic. I'm dealing with the rust one floor board at a time....take up a floor board, fix the rust....that's the way I have to do it so the job won't feel overwhelming

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Old 03-16-2017, 08:09 AM   #7
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It also leaves a coating on the fresh steel to help prevent flash rust.
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Old 03-16-2017, 09:17 AM   #8
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I took some advice without looking into it first and now I'm semi worried. If I were you I would definitely go the rust converter route, I did not. I angle grinded it down as much as possible, after that I bondo over it and now I'm preparing to paint Rust-Oleum over it. Really hoping that's enough. I don't think I could have possibly grinded it out anymore so fingers crossed
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Old 03-16-2017, 01:25 PM   #9
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On my first bus I wire wheeled the rust off the steel floor as much as possible and then coated it with Blackjack roof sealant. It's basically tar with thinners that's about the consistency of mortar when cold. It's obviously petroleum based and didn't stink up the bus as I had expected.

I had precut and marked the replacement plywood I'd cut for the floor. I used a mortar comb to evenly spread the Blackjack and laid the plywood down just like large tiles. Screw the plywood down and it's ready for linoleum.

Obviously I wasn't on a bus build site at that time as I didn't know they existed. The Blackjack actually did work quite well and I'd guarantee water has not rusted the steel sub-floor in that bus. The plywood has gotten soft again after 20 years, but that's because the bus has those bad large once piece windows that allow water to drain into the walls.

Blackjack is unorthodox, I know, but it was effective. It stops the rust permanently and prevents water from contacting the steel sub-floor. The Blackjack didn't stink even during the hot summer days when the bus was closed up. It also penetrated all the screw holes in the floor.

Now I don't buy buses with soft floors. Still in favor of bookmobiles.
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Old 03-31-2017, 01:46 PM   #10
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I'm using Etch & Prep and I really like it. Then I'll be putting a heavy coating of Rustoleum Metal Primer paint to cover the entire interior of the bus.

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