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Old 02-15-2015, 09:54 PM   #81
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no its just from the decade or two of water coming in through the crappy, broken roof hatches.
The tar and metal have a sandwich of rust between them. I'll post some pics in a little while. 60% of the underside of the roof is rusty. maybe more.
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Old 02-15-2015, 10:00 PM   #82
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I see.....So the tar stuff must have held in moisture. Sounds like you have a good plan of treating it, just a bunch of overhead elbow grease ahead of you. You ought to be buff by the time you finish!!
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Old 02-15-2015, 10:17 PM   #83
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Yeah. Even where there isn't rust its clear that there is some funkyness going on with the moisture.
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Old 02-16-2015, 08:07 AM   #84
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I attached a couple pics of the rust and tar.
Attached Images
File Type: jpg 20150214_115624[1].jpg (261.1 KB, 43 views)
File Type: jpg 20150208_180214[1].jpg (322.8 KB, 34 views)
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Old 02-16-2015, 08:10 AM   #85
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This is after taking the tar and crud and rust all down. Ospho then Rusty Metal primer.
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File Type: jpg 20150214_115519[1].jpg (98.5 KB, 31 views)
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Old 02-16-2015, 10:06 AM   #86
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One good thing about the "tar"?...it keeps most of the rust from falling off. Nice work.
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Old 02-16-2015, 01:19 PM   #87
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Wow.....That is crazy. You're doing a great job of cleaning it up.
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Old 02-16-2015, 02:16 PM   #88
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Ok looked mine over today, I have steel ribs with aluminum skin & didn't notice any rust, looks like the tar was used to hold insulation in place, looks like they put a good barrier in place also during construction because I didn't see corrosion between the dissimilar metals either
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Old 02-16-2015, 02:26 PM   #89
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I wouldn't think there would be any corrosion issues on many Crowns.
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Old 02-17-2015, 12:21 AM   #90
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Even though Crowns were sold primarily in the Pacific states, they were built to effectively deal with rusting conditions. Things like using a thick marine plywood floor bolted to the frame instead of a steel floor that would rust. Exterior skin that was made of aluminum instead of steel again helped eliminate the rust problems found in other buses. The corrosion that you do see in a Crown tends to be in the front area near the front passenger door and the front driver's window. This corrosion is caused by the dissimilar metals contacting each other (steel and aluminum). Eventually, the barrier between the metals would wear away and that is when you would get corrosion. Both of my Crowns have these little spots. Easy to fix, unlike so many buses with huge areas of rusting metal. Crowns were built to last 50 years in regular use.
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