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"Putty" in Windshield Pillar Frame?

fine69

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Dec 12, 2004
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'69 Convertible Vette; '72 Z28 Camaro Rally Sport
Helllo All,

When I disassembled my windshield frame, I found a bunch of putty type material inside the pillar header channel – mostly in the corners.

What is this stuff and is this supposed to be there? If so, do I need to replace it? Thanks.

Ralph
:w
 

Artsvette73

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Jan 24, 2004
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174
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New Jersey
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1973 Silver coupe, 1977 L48
We used that in GM way back when. The shop term was dumb,dumb. Why they called it that I don't know. It was used to help stop water leaks.
 
Joined
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Messages
7,246
Location
Washington, Michigan
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'67 Marina Blue Convertible
Actually, we called it "dum-dum" in the plant - same stuff is available today from 3M as "Strip-Caulk"; any automotive body/paint supply store will have it.

:beer
 

fine69

Well-known member
Joined
Dec 12, 2004
Messages
975
Location
Maryland / D.C.
Corvette
'69 Convertible Vette; '72 Z28 Camaro Rally Sport
We used that in GM way back when. The shop term was dumb,dumb. Why they called it that I don't know. It was used to help stop water leaks.

Actually, we called it "dum-dum" in the plant - same stuff is available today from 3M as "Strip-Caulk"; any automotive body/paint supply store will have it.
Hey Guys,

Thanks for your replies. Is this dum-dum stuff needed?
 

Artsvette73

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Joined
Jan 24, 2004
Messages
174
Location
New Jersey
Corvette
1973 Silver coupe, 1977 L48
You diden't say if you removed the windshield. If you have and plan on reinstalling it you may go with urethane sealer. The older cars used a butyal ribbon tape. Which is out lawed in some if not all states. If you use the urethane you won't need to use the dum dum.
 

gmjunkie

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Nov 11, 2004
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Old Fort NC/Vero Beach FL
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03 Z-51,78 L82 Coupe
You diden't say if you removed the windshield. If you have and plan on reinstalling it you may go with urethane sealer. The older cars used a butyal ribbon tape. Which is out lawed in some if not all states. If you use the urethane you won't need to use the dum dum.
It was only Outlawed where Unitized Construction was Involved!!! Unitized vehicles must have glass set with Urethane,or Structural Integrity is Compromised!!:upthumbs

junk!!
 

fine69

Well-known member
Joined
Dec 12, 2004
Messages
975
Location
Maryland / D.C.
Corvette
'69 Convertible Vette; '72 Z28 Camaro Rally Sport
You diden't say if you removed the windshield. If you have and plan on reinstalling it you may go with urethane sealer. The older cars used a butyal ribbon tape. Which is out lawed in some if not all states. If you use the urethane you won't need to use the dum dum.


I have the windshield out. The pillars have all been prepped and cleaned. I'm almost ready for the new windshield, replacement weatherstripping, etc.

Urethane sounds like the way to go.

Thanks.

:w
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
GM never used butyl tape for fixed glass installations - they used Thiokol in the 60's-70's, then changed to urethane; butyl was used by many aftermarket glass shops for replacement windshields, but it won't pass the required MVSS 208 impact requirements.
 

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