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Old 07-07-2015, 03:41 AM   #1
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Best/Quickest/Cheapest Roof Sanding Method

Hey all, I'm new to the forums here. All the information has been super useful! My girlfriend and I own a 77 Gillig bus who is in desperate need of new roof paint. From what I can tell its been painted once and it is a chipping rusty leaky mess. It stays about 1,000 degrees inside on a nice day outside because of it too. I just ordered elastomeric paint to redo the roof and I am wondering what the best plan of attack should be.

60/80 grit sandpaper on a power sander with a good rinse after is the only idea I've had. Using my angle grinder with a wire cup on the whole roof seems like a very tedious and involved project. We're also road bound on the 23rd of July so I'm trying to get this done quick.

Any tips and advice to get a good coating on a roof in very poor condition right now?

Side question too. I need to do a lot of sealing up there (we went through a huge storm in ohio last summer and found out the bus basically leaks from everywhere) is 3M 08300 Ultrapro Autobody sealant a good choice?
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Old 07-07-2015, 07:17 AM   #2
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hi and welcome!

Our roof was not so leaky as yours is described so hopefully someone else can add their 2c.

I'd suggest some POR 15 or Ospho to your plans to deal with your rust issue.

The grit you're suggesting seems pretty aggressive...would hate to hear the roof broke through while sanding; though this may not actually be an issue.

I'm thinking knock the big flakes off, coat with Ospho, then elastomeric it unless you need to patch weld (in which case, you'd do that before coating with anything).

Logic is that few will see the roof and our 4 coats of Henry covered all. Also, make sure your seams and rivets get very well coated in case they leak.
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Old 07-07-2015, 02:48 PM   #3
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I used 3M 08505 Fast N Firm seam sealer on the rain gutters of my Land Cruiser. Seemed to work well, and didn't shrink as it dried. Also didn't leak, which was the main idea.

That 08300 looks like good stuff, too. Lots of 3M options...
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Old 07-07-2015, 11:29 PM   #4
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It's seems that your bestest choice would be the very choice that Hubby & I chose not to do and hope to never have to do.

Pull down your ceiling and take it down to bare metal and start over. I don't think that just putting extra blobs of paint on every rivet & seam will solve your leaks and problems.

Many, many, many people here have done it, it looks a big pain in the YOU KNOW WHERE but I don't think anyone who has done it has come back & said that "that was the biggest waste of time. never again".

We don't have a lot of time & money put into ours as of yet, but what we've done I know I want to keep in all it's glory, right or wrong. I think you will probably share that same feeling once you start your build. It don't matter how good of a job or how sucky of a job you did......you did it & you will be proud of it.
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Old 07-07-2015, 11:37 PM   #5
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Old 07-07-2015, 11:55 PM   #6
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^ did that once. never again!
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Old 07-08-2015, 01:33 AM   #7
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Old 07-08-2015, 03:50 PM   #8
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Solar Fan

Maybe this is not the thread for this, but is about keeping the bus cool, any opinions on this:

http://www.costco.com/Solar-Attic-Fa...100154226.html
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Old 07-08-2015, 04:07 PM   #9
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Quote:
Originally Posted by juliol View Post
Maybe this is not the thread for this, but is about keeping the bus cool, any opinions on this:

http://www.costco.com/Solar-Attic-Fa...100154226.html
That's a good option for us, this whole thing is ways to keep the bus cooler. 35' metal tube in full sun is rough. We don't have any working fans currently and I've been looking into more solar options.


I'm thinking the best way is just get up there with a palm sander, respirator and a lot of motivation. I was thinking of using the 30800 3M stuff because I was concerned about the fast n firm being too... firm. Our old diesel has a lot of vibration too it so I want something that's more flexible.
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Old 07-08-2015, 04:11 PM   #10
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Quote:
Originally Posted by Seroflorus View Post
hi and welcome!

Our roof was not so leaky as yours is described so hopefully someone else can add their 2c.

I'd suggest some POR 15 or Ospho to your plans to deal with your rust issue.

The grit you're suggesting seems pretty aggressive...would hate to hear the roof broke through while sanding; though this may not actually be an issue.

I'm thinking knock the big flakes off, coat with Ospho, then elastomeric it unless you need to patch weld (in which case, you'd do that before coating with anything).

Logic is that few will see the roof and our 4 coats of Henry covered all. Also, make sure your seams and rivets get very well coated in case they leak.

I think it has mostly been the seams and rivets. Something is leaking in the front though that causes small waterfalls to come in through the dash and windshields. I blame the almost 40 year old rubber gaskets for some of it. We have to get the windshield replaced this week so hopefully that will help. I haven't looked at the roof in awhile and I am hoping I am imagining more rust then there actually is. Won't find out until I can get back up there this week. Previous owners did take it to Burning Man though and that dust is about the worst thing any metal can go through.
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