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Old 04-26-2017, 10:59 PM   #61
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As I understand it, the Great Stuff needs to be able to cool off to get solid. Otherwise it droops like slime and hardens. As long as it's touching at least one metal surface, so it can cool down, it seems to work.
I've filled everything I could fill with canned foam, even inside the ribs. I haven't cut a rib open to check but it seems to have worked fine. And as a bonus, this baby should float.
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Old 04-27-2017, 05:28 AM   #62
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As I understand it, the Great Stuff needs to be able to cool off to get solid. Otherwise it droops like slime and hardens. As long as it's touching at least one metal surface, so it can cool down, it seems to work.
I've filled everything I could fill with canned foam, even inside the ribs. I haven't cut a rib open to check but it seems to have worked fine. And as a bonus, this baby should float.
Dude be real careful with Great Stuff. It can be corrosive to metals and doesn't cure in closed areas.
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Old 04-27-2017, 08:58 AM   #63
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I've already made that mistake months ago, so there's always hope for my second bus.
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Old 04-27-2017, 10:31 AM   #64
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Dude be real careful with Great Stuff. It can be corrosive to metals and doesn't cure in closed areas.
I've always heard that its not the great stuff itself that is corrosive to metal, just that you can easily trap moisture behind it and that will cause corrosion. But couldn't that same problem happen with legit spray foam if the surface wasn't prepared correctly when sprayed?
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Old 04-27-2017, 10:38 AM   #65
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Great Stuff is indeed corrosive to bare metal. Also...never try to inject it into a closed space. It will never cure except for a thin layer around the edges.
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Old 04-27-2017, 11:30 AM   #66
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I've always heard that its not the great stuff itself that is corrosive to metal, just that you can easily trap moisture behind it and that will cause corrosion. But couldn't that same problem happen with legit spray foam if the surface wasn't prepared correctly when sprayed?
No tis the chemicals in Great Stuff. They don't cure properly in any kind of enclosed space, and they react with the metal.
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Old 04-27-2017, 12:09 PM   #67
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Ok, you made me curious about the foam in my ribs. I checked five rivet holes on ribs throughout the bus and all had properly cured foam in them except for one. I can't say if that's a consistent rate of failure or not, but I don't think it's worth worrying about.

Perhaps it will corrode the metal at some point. If that's true about the chemicals in Great Stuff it would seem that any contact between the foam chemicals and metal skin and ribs, not in enclosed areas, would also eventually have a corrosive reaction because of the chemicals and contact with steel surfaces.

So far the foam inside the ribs stopped the leaking problem, which is why I considered the foam solution in the first place, based on my memory of someone else previously doing the same thing. All I can say is it worked, otherwise I'd need a gutter system mounted on my chair rail.
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Old 04-27-2017, 12:40 PM   #68
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No use worrying about it now. We all make mistakes and move on. Good for anyone out there reading along to know for the future, though.

Funny you mention the gutter system. The chair rail IS sort of a gutter from the factory. The condensation that doesn't get trapped in the fiberglass batting runs down the walls and drains down through the bottom of the chair rail. On my bus that's how it is, anyhow.
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Old 04-27-2017, 12:42 PM   #69
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Interesting. It should be fine on primed metal that isnt covered until after it cures though, correct? That was my plan.
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Old 04-27-2017, 01:06 PM   #70
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It became very obvious that my side panels need to drain about the time the heavy fall rains started. No I'm not going to worry about it. I'm pretty sure this bus will outlast me.
That's the thing about being offline for ten months last year while I was working on this bus. I had no way to ask questions, and my memory aint that great. On the bright side I got more work done because I wasn't messing around with the internet.
I don't mean to be crass, but I'd do it again to stop the leaking.
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