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Old 11-15-2001, 10:20 AM
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Join Date: Jul 2000
Location: McLean, Virginia
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adhesive recommendations

On older cars the windshield washer squirter was driven by a rubber bulb mounted on a fitting in the footwell. Mash the bulb, drive air via a tube to the fluid bag, that forces fluid to the jet on the hood. The rubber bulb is actually two halves cemented together at their widest point. One of the halves has a large hole which is cemented to an aluminum flange. That flange is how the device is fastened to the bracket that connects everything to the floor. Also, the air emerges from the bulb through the aluminum flange into the tube to the bag.

The rubber bulb on mine has separated intact from the aluminum. I suppose the old adhesive simply dried out. What is the best modern adhesive to fasten rubber to aluminum? It will have to form an airtight seal as well. Also, the circumference where the rubber halves is cracking and there may be pinholes. What is the best goo to use to fill these small cracks and to restore adhesion? The halves have not separated yet, but this is not far off.

Suggestions received so far include: Weldwood Contact Cement, Goop, RTV Silicone.

Thanks. I'm placing this on the Vintage list as well.
1959 M-B 220S cabriolet
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Old 11-15-2001, 10:29 AM
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Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
Goop should do it
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

1995 E500 street car
1986 Porsche 944 Turbo S track car
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Old 11-15-2001, 11:37 AM
94 E320
Join Date: Jun 2001
Location: Fairfax, VA
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3m weatherstrip glue should be bad either

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Old 11-15-2001, 02:09 PM
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Permatex Black Rubber Sealant. It is formulated specifically for use on rubber & will adhere much better than silicone or other multipurpose goops. See my post in this thread: Wind noise on W126 cars

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Old 11-17-2001, 01:01 PM
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Posts: 57
Go to your local glass auto glass shop, and have them put a little urethane on it. This is what new car windshields are glued & sealed with.
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Old 11-17-2001, 11:53 PM
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JB Weld two part epoxy sounds like a good candidate.

'93 300E 4Matic
'98 Nissan Altima
'00 Yamaha Road Star Silverado
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Old 11-18-2001, 05:36 PM
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Location: McLean, Virginia
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Thanks for all the suggestions. Here is what I did and how it turned out: (1) for the cracks around the circumference of the bulb, I went with Permatex Rubber Sealant, stuff in an orange tube. I compressed the bulb in a vise and smeared the goo into all the cracks and splits with a toothpick. Let the bulb return to normal shape and sit for 24 hours. Voila! No air leaks and the bulb compresses with some flexibility at the seam. I think I am happy with this choice. (2) for mounting the bulb to the aluminum flange, I decided to go with Pliobond, a flexible type of contact cement. One coat on both parts. Let dry. One coat on aluminum and let it get tacky. Then fitted together and shortly thereafter fitted bulb and aluminum to its bracket and tightented the holding nut and washer. Let sit 24 hours. It all worked and there is no air leakage. Hope it holds up!
1959 M-B 220S cabriolet
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