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Old 01-24-2019, 11:43 PM   #1
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Black Goo Removal

I may have discovered the secret of the goo. You know the black gooey adhesive that is generously used by bluebird to stick the fiber glass in the walls and ceiling. I tried a test spot using some naphtha degreaser and it worked but makes a mess and would be painfully slow. I tried heating with a heat gun, again a gooey mess.

Then I thought "What if it was cold?" Right now it is 3*f outside. Using a small ball peen hammer I lightly tapped on the frozen goo. After a little tapping it breaks off in nice little chunks leaving the paint underneath undamaged and mostly clean. It doesn't seem to be leaving any reverse hail dents or causing damage to the exterior paint either.

When I have time I am going to pick up some dry ice and see if making it really cold might make it easier still. I also want to see if I can get a needle scaler to work at a low enough pressure to not tear up the interior paint.

I know "pictures or it didn't happen". Below is what I removed in about 30 sec of cautious tapping. Scraping with a metal putty knife worked too but it scratched up the paint.

Ted
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Old 01-25-2019, 06:18 AM   #2
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Ward had a crazy asphalt-based goo. I spent 6 months removing it and the rust underneath.

Good job man!
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Old 01-25-2019, 07:58 AM   #3
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Believe it or not, that's a sound deadener. Causes the sheet metal to vibrate less. Kinda like the stuff they put on stainless steel sinks. Along with various other things, I'm actually thinking of doing spray on bed liner when the walls are stripped. When I get a bus that is. The quieter the better.
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Old 01-25-2019, 08:18 AM   #4
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Quote:
Originally Posted by jimburke77502 View Post
Believe it or not, that's a sound deadener. Causes the sheet metal to vibrate less. Kinda like the stuff they put on stainless steel sinks. Along with various other things, I'm actually thinking of doing spray on bed liner when the walls are stripped. When I get a bus that is. The quieter the better.
It also does a great job of collecting condensation between it and the metal over time. At least on old Wards.
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Old 01-25-2019, 09:02 AM   #5
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My concern is that spray foam won't stick to the goo very well or it might eventually separate from the metal. Also as ECCB mentioned rust might be hidden underneath or leave the potential to rust. I think the 2.5" to 3" of spray foam I plan on adding should take care of the sound deadening.

Ted
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Old 01-25-2019, 09:05 AM   #6
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Different "goo" seems to have been used over the years. My '46 had a layer of asphalteum on the floor and it was almost perfectly rust free.


Also a royal beotch to get off for painting!
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Old 01-25-2019, 09:11 AM   #7
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Different "goo" seems to have been used over the years. My '46 had a layer of asphalteum on the floor and it was almost perfectly rust free.


Also a royal beotch to get off for painting!
I think it would work better on floors than ceilings!
Man that's some nasty stuff to remove.
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Old 02-17-2019, 09:40 PM   #8
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I got back to goo removal today. Unfortunately (not really) I was on a ski trip a couple weeks ago and missed the night time lows of -22*F at home.

I picked up some dry ice blocks and denatured alcohol. First I sprayed the wall with alcohol and then used magnets to hold the blocks on the wall.The alcohol helps conduct the heat from the wall to the dry ice more quickly and lubricates the scraper. I used 2 blocks so each area had twice the time to cool as it took to scrape an area. I was able to get most of the goo off the panels below the windows in a few hours. It took a total of 20lbs
of dry ice ($24) and about a half gallon of alcohol ($5)

I scraped as far down into the pocket behind the chair rail as I could reach. I'll either come back to the pockets with a longer scraper or hit it with naphtha. When I get a warm day and all the alcohol is evaporated/ventilated I'll clean up the scrapings with a shop vac. I'll finish up by wiping the goo residue with some naptha.

Here is a video of how well it works. Its faster when you can use your other hand to press the scraper toward the wall instead of holding a phone to video.

https://youtu.be/vDCDf60qr4s

Next up will be the ceiling. I'm going to pick up some stronger magents that have threaded rod so I can drill holes in my dry ice blocks and attach them to the magnets with fender washers and wing nuts.

Ted
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Old 02-18-2019, 12:30 AM   #9
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WHAT FER? THATS PUT ON TO HELP WITH SOUND DEADENING ISNT IT I MAY BE WRONG?
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Old 02-18-2019, 12:37 AM   #10
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Here in maine we use roofing tar and spray over it with acrylic enamel best rust proofing you can get if its stays soft and pliable
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