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Old 09-10-2019, 09:45 PM   #11
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If I just leave it, it will continue to rust so I kinda have to do something about it, don't I?
That's what I figured, but the way you worded that made me wonder if you were talking about just covering the rust in enamel and moving on. Once the rust is treated paint it any color that suits your fancy.
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Old 09-10-2019, 11:44 PM   #12
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That's what I figured, but the way you worded that made me wonder if you were talking about just covering the rust in enamel and moving on. Once the rust is treated paint it any color that suits your fancy.
Well, Rustoleum rusty metal primer goes directly onto the rust, but I'm not sure if that counts as "treating" it.

I have a bunch of angle brackets that came off the bottom of my bus that are in the same rust condition as the rest of it, and I've been doing a bunch of experiments on the best way to get a solid layer of paint attached to it. The best so far has been the ospho + POR-15 but the latter is pretty expensive stuff. The rusty metal primer directly on the rust + enamel seems to be nearly as good, and turns the job into basically just painting.
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Old 09-11-2019, 01:27 AM   #13
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In your experiments, have you developed a good eye at spotting lightly rusted pieces? I ask because the lightly rusted parts can be converted and painted. The heavily rusted are structurally weakened. It is difficult to determine the good stuff from the bad at times.


I do wish you luck with your underbody protection. I will be doing *something* to ours once I have the time. So this thread bears much interest to me. I'd like to hear how it is going for you.
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Old 09-11-2019, 05:47 AM   #14
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Well, Rustoleum rusty metal primer goes directly onto the rust, but I'm not sure if that counts as "treating" it.

I have a bunch of angle brackets that came off the bottom of my bus that are in the same rust condition as the rest of it, and I've been doing a bunch of experiments on the best way to get a solid layer of paint attached to it. The best so far has been the ospho + POR-15 but the latter is pretty expensive stuff. The rusty metal primer directly on the rust + enamel seems to be nearly as good, and turns the job into basically just painting.
It IS just painting. You'd be better off skipping it instead, IMO.
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Old 09-11-2019, 06:46 AM   #15
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In your experiments, have you developed a good eye at spotting lightly rusted pieces? I ask because the lightly rusted parts can be converted and painted. The heavily rusted are structurally weakened. It is difficult to determine the good stuff from the bad at times.


I do wish you luck with your underbody protection. I will be doing *something* to ours once I have the time. So this thread bears much interest to me. I'd like to hear how it is going for you.
The underside has a pretty consistent layer of surface rust everywhere - the holes in the floor all rusted through from the inside, and it's easy to tell the bad stuff from inside (visually and from walking on it). The worst parts of the floor are a couple of feet in the back where I've finished welding patches over all the holes, and about an eight-foot section around the wheel wells that I'm going to cut out and rebuild entirely.

The rest of the floor has a few small holes ("small" for me is like < 3", ha) but is basically OK from the middle forward. The original floor was 16 ga. I osphoed the rust off both sides of a couple of samples from my floor and cleaned them up and measured the thickness, and they were barely off the original 1/16" (although with light pitting so not quite as strong as originally).

I think my plan might be to try the rust primer + enamel everywhere, and then whenever the paint fails in one place and continues to rust, treat that area with ospho and POR-15.
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Old 09-11-2019, 06:53 AM   #16
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It IS just painting. You'd be better off skipping it instead, IMO.
Well, I meant it turns the task that I have to do into just prepping and painting. I don't know how long rusty metal primer + enamel will remain adhered to rusty metal, but as long as it lasts it will stop further rust, whereas if I did nothing it would continue to rust. Maybe I'm missing something, but I think doing nothing is my worst option.
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Old 09-11-2019, 06:55 AM   #17
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Well, I meant it turns the task that I have to do into just prepping and painting. I don't know how long rusty metal primer + enamel will remain adhered to rusty metal, but as long as it lasts it will stop further rust, whereas if I did nothing it would continue to rust. Maybe I'm missing something, but I think doing nothing is my worst option.
By encasing the rust with paint you'll only accelerate it.
Rustoleum doesn't "stop rust" despite advertising such on the can. Its just oil based enamel spray paint.
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Old 09-11-2019, 07:00 AM   #18
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By encasing the rust with paint you'll only accelerate it.
Rustoleum doesn't "stop rust" despite advertising such on the can. Its just oil based enamel spray paint.
I'm using this stuff: https://www.rustoleum.com/product-ca...y-metal-primer (the rusty metal primer, not the white clean metal stuff) which as I understand it is not the same as the standard spray can stuff. The enamel layer would be, but I'm not putting that directly on the rust.
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Old 09-11-2019, 12:05 PM   #19
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I'm using this stuff: https://www.rustoleum.com/product-ca...y-metal-primer (the rusty metal primer, not the white clean metal stuff) which as I understand it is not the same as the standard spray can stuff. The enamel layer would be, but I'm not putting that directly on the rust.
Its just brown enamel.
That's some clever marketing but those claims are really boisterous. Its just paint. There's no magic ingredient in it that's not in every kind of spray paint or bucket of over the counter enamel product.
Unless you treat the rust, the chemical reaction continues.
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Old 09-11-2019, 12:41 PM   #20
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Personally I don't think you'll ever get the underside of a bus clean enough to accept paint.
And you'd be screwed if you scrapped it now. When I scrapped my 87 BB, scrap was paying $7.50 for vehicles and $6 for scrap/ Went by yesterday and vehicles are down to $3.50 and scrap at $3 (/100lbs). I made money on my scrapped bus, at todays rate I would have lost considerably.
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