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Old 05-25-2008, 02:09 PM   #85
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Hey folks, I have a 1996 AS 30 ft. It is badly faded on the roof crests along the top of each side. Will these methods work on a 1996? It will be a summer project for me. I have ordered Removall, F-7, grade-C and S. I have a power rotary polisher.
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Old 05-25-2008, 02:19 PM   #86
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Welcome to the AIR forum Easyriser. That should do ya! Along with lots of elbow grease!
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Old 05-25-2008, 02:24 PM   #87
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Very good info and interesting too. How does one calculate the exact percentage of material removed. It sounds as if it's possible to measure that amount? Micrometer?
One of the ways I like is the use of a tripod fixture with a dial indicator mounted with the plunger going through the stand. take a reference depth on good material and then slide the fixture over the damage keeping the tripod feet off the cleanup area and see what the difference is.
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Old 05-25-2008, 02:28 PM   #88
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One of the ways I like is the use of a tripod fixture with a dial indicator mounted with the plunger going through the stand. take a reference depth on good material and then slide the fixture over the damage keeping the tripod feet off the cleanup area and see what the difference is.
Wow, very cool! Are those easy to obtain? Sounds like a special order item?
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Old 05-25-2008, 03:39 PM   #89
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Wow, very cool! Are those easy to obtain? Sounds like a special order item?
We generally make them for specific applications
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Old 05-25-2008, 03:44 PM   #90
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I went to NAPA and bought 3M paper. Clerk looked it up and it is ALO2 but who knows what the binder is.... Wet sanding with the finishing sander in one hand and the hose in the other. 5 seconds of sanding followed by washing off the gray stuff. A 50 year old trailer has a thick layer of life on it. I think alot of the stuff is dirt that just will not come off any other way. This could take awhile... using 360, 600, 1000, 1500.
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Old 05-25-2008, 03:57 PM   #91
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sandpaper only as last resort

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I went to NAPA and bought 3M paper. Clerk looked it up and it is ALO2 but who knows what the binder is.... Wet sanding with the finishing sander in one hand and the hose in the other. 5 seconds of sanding followed by washing off the gray stuff. A 50 year old trailer has a thick layer of life on it. I think alot of the stuff is dirt that just will not come off any other way. This could take awhile... using 360, 600, 1000, 1500.
Do you have filiform corrosion too?

I used the F7 compound first and only then realized that I was dealing with worm-sign or filiform corrosion that wouldn't budge merely with compound. Check out the first couple of photos in post number one. There you can see the filiform corrosion in the middle of the compounded section. Only after first trying the compound and failing did I decide to use sandpaper.

Use the sandpaper only when absolutely necessary in a zero choice situation. It's a lot of work and highly abrasive unless for some reason you've got lots of spare elbow grease and infinite time on your hands!

Also I would strongly recommend starting with an absolutely clean metal. Use a brush and a safe cleaner for aluminum metal to remove any accumulated dirt and mildew deposits on the metal before any compounding/sanding/polishing.

Post some pics so we can see what you're dealing with.
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Old 05-25-2008, 04:45 PM   #92
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We generally make them for specific applications
Rats! Or should I say worms!

It would be interesting to use one of these to learn how much material these heavy papers are taking off the skin or in other words how deep the corrosion has burrowed into the metal.
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Old 05-26-2008, 04:51 AM   #93
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I don't like to rain on anybody's parade but if those pits are 1/32" deep you are in big trouble as the skin is only .032 which is the same as 1/32".
Okay I might be exaggerating a bit, I am a man and everything is larger and longer than in reality.... they are deep though. The salt air down on the eastern shore must have gotten to it. All the severe stuff is under the door eyebrow.
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Old 05-26-2008, 08:02 AM   #94
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A little experiment with the sander yesterday.

I went from the 600 to the G Nuvite Disk to the F7 Cyclone. So alot more to do. It does give a more uniform finish. Sanding was with the sander in one hand and the hose in the other. Hand sanding actually was cutting more, I think too much and making pressure marks. Paper wrapped around a hard rubber block may be the best. Water then sand as it ran down the side then more water. This keep the paper clean. Some how I didn't get shocked but you may not be as lucky depending on your sander.

http://www.airforums.com/forums/f109...9-a-10709.html

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Old 05-26-2008, 10:41 AM   #95
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sanding: power vs. hand

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Originally Posted by Over59
A little experiment with the sander yesterday.

I went from the 600 to the G Nuvite Disk to the F7 Cyclone. So alot more to do. It does give a more uniform finish. Sanding was with the sander in one hand and the hose in the other. Hand sanding actually was cutting more, I think too much and making pressure marks. Paper wrapped around a hard rubber block may be the best. Water then sand as it ran down the side then more water. This keep the paper clean. Some how I didn't get shocked but you may not be as lucky depending on your sander.
Do you mean you used a power sander with the sandpaper? In addition to a variable speed polisher and the cyclone polisher? What kind of power sander were you using?

I also like your idea of using paper wrapped around a hard rubber block. I'll give that a try too. In your experiment it seems like you're preferring hand sanding with a block to power sanding?

Your work looks great! Thanks for the photos. I'm also curious about your experiments because apparently you're working with heavy oxidation as opposed to a deeply embedded filiform corrosion. And the sanding appears to be giving faster results as opposed to mere compounding.

How do you like the G6? I ordered some F9. Maybe I'll try the G6 at some point too.
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Old 05-26-2008, 03:33 PM   #96
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Day 2.
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Old 05-26-2008, 06:09 PM   #97
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Wow

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Day 2.
About this time your muscles should be seizing up from all that work!!! Looks great!

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Old 05-27-2008, 03:43 AM   #98
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I want to know how you guys can get that much done in so little time. It took me 20 hours to do just the amount you are showing in that photo Over59... Can you come over and play?
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