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Old 09-10-2019, 07:41 PM   #1
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Yellow underside?

Is there any reason not to paint the underside of my bus yellow? My original plan was to ospho the underside and then paint it with POR-15, but I decided this would take too long and be too expensive and toxic. Instead I'm planning to use two coats of Rustoleum rusty metal primer over the rust and then one or two coats of rustoleum enamel. I could use black enamel but I'm thinking I want a paint color that will readily reveal any rusting-through problems. Yellow ("safety yellow") seems to be the only color light enough for this.
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Old 09-10-2019, 09:04 PM   #2
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would painting also help protect against future rust in future salty winters up above the Rust Belt? Thanks for this question, I hope someone more experienced can answer it for you soon!
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Old 09-10-2019, 09:14 PM   #3
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would painting also help protect against future rust in future salty winters up above the Rust Belt? Thanks for this question, I hope someone more experienced can answer it for you soon!
Yeah, if the paint layer adheres and prevents any water from contacting the metal, it will stop further rusting. But it's the underside of the bus so there will be a lot of road debris chipping away at the paint and re-exposing the metal. And my bus is sufficiently rusted that I'm sure sometimes chunks of paint will just fall off, so I'll need to keep a perpetual eye on things. Black enamel would just hide any problems as they're developing.
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Old 09-10-2019, 09:15 PM   #4
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Why do you want to paint the underside of the bus? I see you're in the city of brotherly love, major rust belt. (I use to live right around there, I would get off the subway at 5th and market all the time).

What kind of rust are you talking about here? Surface or cancer, Why not make life simple on yourself, just wire brush the surface stuff off spray on a rust CONVERTER (Rust Reformer by rustoulam) and put on something like fluid film? I hear it's good for the salt belt. Cancer has to be cut out, and replaced. A quick coat of paint is not going to anything to stop or slow down that rust.
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Old 09-10-2019, 09:31 PM   #5
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What kind of rust are you talking about here? Surface or cancer, Why not make life simple on yourself, just wire brush the surface stuff off spray on a rust CONVERTER (Rust Reformer by rustoulam) and put on something like fluid film? I hear it's good for the salt belt. Cancer has to be cut out, and replaced. A quick coat of paint is not going to anything to stop or slow down that rust.
This kind of rust: https://imgur.com/a/yisoA9i

Can't replace the entire floor (although I will be doing exactly that around the wheel wells). Spraying anything from below (ospho or rust converter) is the "toxic" bit I'm looking to avoid, both to myself and to the lot where my bus is parked.
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Old 09-10-2019, 09:33 PM   #6
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Is there any reason not to paint the underside of my bus yellow? My original plan was to ospho the underside and then paint it with POR-15, but I decided this would take too long and be too expensive and toxic. Instead I'm planning to use two coats of Rustoleum rusty metal primer over the rust and then one or two coats of rustoleum enamel. I could use black enamel but I'm thinking I want a paint color that will readily reveal any rusting-through problems. Yellow ("safety yellow") seems to be the only color light enough for this.
YOu still gona ospho it?
I'd rather just leave rust than paint over it.
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Old 09-10-2019, 09:35 PM   #7
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Holly crap dude, I don't think anything will help that mess! Was it a sight unseen buy?

Looks like your still early in the build, scrap it, sell it and find a rust free bus. Oh come now, the rust converter is not that bad. You're not spraying on radioactive paint.

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This kind of rust: https://imgur.com/a/yisoA9i

Can't replace the entire floor (although I will be doing exactly that around the wheel wells). Spraying anything from below (ospho or rust converter) is the "toxic" bit I'm looking to avoid, both to myself and to the lot where my bus is parked.
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Old 09-10-2019, 09:39 PM   #8
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YOu still gona ospho it?
I'd rather just leave rust than paint over it.
If I just leave it, it will continue to rust so I kinda have to do something about it, don't I?
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Old 09-10-2019, 09:40 PM   #9
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Holly crap dude, I don't think anything will help that mess! Was it a sight unseen buy?

Looks like your still early in the build, scrap it, sell it and find a rust free bus. Oh come now, the rust converter is not that bad. You're not spraying on radioactive paint.
I was actually going to say something before like "please don't say scrap the bus, I've heard it before." Honestly, if you don't have something constructive to say, I really don't want to hear it.
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Old 09-10-2019, 09:44 PM   #10
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Aye, each to their own. Makes a lot lot more work for yourself

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I was actually going to say something before like "please don't say scrap the bus, I've heard it before." Honestly, if you don't have something constructive to say, I really don't want to hear it.
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